A motorist travels to a place 150 km away at an average speed of 50 km and returns at 30 km per hour. His average speed for the whole jurney in km per hour is :

A motorist travels to a place 150 km away at an average speed of 50 km and returns at 30 km per hour. His average speed for the whole jurney in km per hour is : Correct Answer 37.5

Hints: বেগ = দূরুত্ব /সময় average speed = 150 + 150 / (150/50 + 150/30) = 37.5km/h
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