Question

A trip on a Sunday
We started from Pune at 5.00 am in my friend's car to reach a hill station, which was 135 km. It took us 3 hrs to reach. We spent the whole day and returned
home around 8.00 pm. On our way back, we took 4 hrs to reach home due to the heavy traffic.
The average speed of our return journey was:
A 5.35 m/s
B. 8 m/s
C. 9.38 m/s
D. 11 m/s​

Answer 1

Given : Started from Pune at 5.00 am in my friend's car to reach a hill station, which was 135 km. It took us 3 hrs to reach. Spent the whole day and returned  home around 8.00 pm. On  way back, we took 4 hrs to reach home due to the heavy traffic.

To Find : The average speed of our return journey was:

A 5.35 m/s

B. 8 m/s

C. 9.38 m/s

D. 11 m/s​

Solution:

Distance one side = 135 km = 135 x 1000 m

Distance in going  = 135 x 1000 m

Distance in Return = 135 x 1000 m

Time taken in going = 3 hr  = 3 x 3600 sec

Time in Return =  4 hr  = 4 x 3600 sec

Average speed in return journey =   135 x 1000 /  4 x 3600

= 9.375

= 9.38 m/s

The average speed of our return journey was: 9.38 m/s

Option C is correct

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