A man walks on a straight road form his home to a market 2.5 km away with speed of 5 `(km)/(hr)`.
Channel: Doubtnut
Date: 2020-07-26

A man walks on a straight road form his home to a market 2.5 km away with speed of 5 `(km)/(hr)`. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 `(km)/(hr)`. The average speed of the man over the intervel of time 0 to 40 min is equal to