Question

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 :​

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:

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

or 135/ 4  = 33.75 km/hr

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