Saturday, 6 May 2017

How to solve Time and Distance Problems using Time and Distance Formulas For IBPS PO Exam.

Solve Time and Distance Problems using Time and Distance Formulas for IBPS PO Exams
Time and Distance Formulas
 IBPS PO Exams. You can solve Time and Distance Problems within 35 seconds, if you have all the Time and Distance formulas up your sleeves. This is a simple concept and you can solve all the time and distance problems by just substituting the values in the formulas.
In this post, we will discuss Time and Distance Problems and Time and Distance Formulas which will help you solve these problems in minimum time.

List of Time and Distance Formulas to Solve Time and Distance Problems
Time and Distance Formulas

Time and Distance Formulas

Time and Distance Formulas

Relationship between Speed, Distance and Time. 
Time and Distance Formulas
Time and Distance Formulas
Time and Distance Formulas
 Variables for measurement and Conversion of these measurements

Generally, speed is expressed as km/hr or m/sec, distance is expressed in meters or km and time is expressed in seconds(sec) or hours(hr)

Formulas to Convert Measurement
Time and Distance Formulas
Time and Distance Formulas
Time and Distance Formulas
Time and Distance Formulas
Time and Distance Formulas
Example 1: Convert 72 km/hr into m/s
Solution:
Step 1:
To convert 72 km/hr into m/sec, we need to multiply,
72 x 5/18 = 20 m/sec

Example 2: Convert 15 m/s into km/hr
Solution:
Step 1:
To convert 15 m/sec into km/hr, we need to multiply,
15 x 18/5 = 54 km/hr

Module 1: Basic Time and Distance Problems solve using Time and Distance Formulas.

Question: A bus covers 216 km in 4 hours, convert the speed of the bus in m/s.

Solution:
Step 1:
To find the speed of the bus we use the time and distance formula,
Speed = Distance / Time
By substituting the values in the time and distance formula,
Speed = 216/4
Speed= 54 km/hr

Step 3:
As we need to convert the speed from km/hr, we need use the formula,
1 km/hr =5/18 m/sec
By substituting the values in the formula,
54 x 5/18
= 15 m/sec

Therefore, the speed of the bus is 15 m/sec.

Example 2:
Question: A man walks at the speed of 54 km/hr and runs at the speed of 10 km/hr. How much time will the man require to cover the distance of 28 km, if he covers half (first = 14 km/hr) his journey walking and half of his journey running?

Solution:
Step 1:
As you know, Time = Distance/Speed
We need to find the total time taken by the man to finish his journey we need to add the time taken by him by walking and running.
Total Time = Timewalk + TimeRun =( Distancewalk / Speedrun ) +( Distancewalk/ Speed run)
Step 2:
By substituting the values in the formulas
Total Time = (14/5) + (14/10)
= 42/10
= 4.2 hours

Therefore, the man takes 4.2 hours to finish his journey.

Example 3:
Question: A man takes 6 hours in walking to a certain place and riding back. He would have taken 2 hours less by riding both ways. What will be the time required by him to walk both ways?

Solution:
Step 1:
A man takes 6 hours in walking to a certain place and riding back.
So, timewalk + timeride = 6 - Equation 1

Step 2:
He will take 2 hours less if he rides both ways
timeride + timeride = 4 - Equation 2
2 x ride = 4
ride = 4/2
ride = 2
ride = 2

Step 3:
by substituting the ride value in the first formula we get,
timewalk + 2 = 6
timewalk = 6 -  2
 timewalk = 4

Step 4:
We need to find the time taken by the man to walk both ways,
timewalk + timewalk
4 + 4 = 8

Therefore, a man takes 8 hours to walk both ways.
Time and Distance Formulas
Module 2: How to solve Time and Distance Problems using Time and Distance Formulas when Distance remains constant.

Example 1:
Question: A cyclist travels a certain distance in 6 hours at a uniform speed. In the return journey, he increases his speed to 2 km/hour and covers the same distance in 5 hours. What was his initial speed?

Solution:
Step 1:
In the question, it is mentioned that the distance remains constant
So,   d1 = d2...................................1

Step 2:
Distance = speed x time ..........................2

Step 3:
By substituting the equation 1 in equation 2 we get,
speed1 x  time1 = speed2  x  time2

Step 4:
By substituting the values in the above formula
s1 x 6 = (s1 + 2) x 5 ( as the speed is increases 2km/hr 
6s1 = 5s1 x 10
6s1 - 5s1 = 10
s1 = 10 km/hr

Therefore, the initial speed of the man was 10 km/hr

Example 2:
Question: A student walks to school at a rate of 2.5 km/hr and reached six min late. Next day he increases his speed and then reached 10 min early. What is the distance of the school from his home?

Solution:
Regular  Method:
Step1:
Let us assume the right time to reach school as 't.'
Let us assume t- 6 to be the late time taken by the student to reach school.
Let us assume t2 + 10 as the time when the student reaches school early.
Now we know can say that,
t1 - 6 = t2 + 10

Step 2:
 As we know, Time = Distance / Time
Substitute the Time formula into above equation we get,
(d1 / s1) - 6 = (d2 / s2) + 10

Step 3:
As the student travels from his home to school i.e. distance remains constants.
d1 = d2 can be assumed as 'd.'

Step 4:
As the units are varying we need to convert them into,
The speed is given in km/hr we need to convert 6 minutes and 10 minutes into hours.
So, 6 minutes = 6/60 hr and 10 minutes = 10/60 hr.

Step 5:
By substituting the values in the time and distance formulas,
d/2.5 - 6/60 = d/2.5 + 2 + 10/60
d/2.5 - d/4.5 = 6/60 + 10/60
d [ 4.5 + 2.5] / [ 2.5 x 4.5] = 16/60
d = 16/60 x  (2.5 x 4.5) / 2
d = 1.5 km

Therefore, the distance travelled by the student from home to school is 1.5 km.

Smart Method
The same problem can be solved via using the formula- 
Time and Distance Formulas
Here, Δt is the difference between the time from the actual time.
i.e. 10 + 6 = 16 sec (This can be verified from the traditional method)
16/60 hours
s₁ and s₂ is the speed limits.
s 〜 s₂ is the difference between the speed.

By substituting the values in the formulas we get,
d = 16/60 x  (2.5 x 4.5) / 2
d = 1.5 km

Therefore, the distance travelled by the student from home to school is 1.5 km.

The formula is used to solve these kinds of problems where d is constant. Be careful before you use the formula. This formula is the short-cut method to solve the time and distance problem in the minimum time taken. 

Do write down in the comment section how this blog helped you to solve Time and Distance Problems using Time and Distance Formulas.

Stay tuned for the next post.
Time and Distance Formulas
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