A motorist travels to a place 150 m away at an average speed for 50 km and returns at 30 km per hour. What is his average speed for the whole journey in km per hour ?

A motorist travels to a place 150 m away at an average speed for 50 km and returns at 30 km per hour. What is his average speed for the whole journey in km per hour ? Correct Answer 37.5

Hints: বেগ = দূরত্ব / সময় Average বেগ বার করতে Total travelling time বপর করতে হয়। প্রথমে সময় লাগে = 150/50 = 3 hr পরে সময় লাগে = 150/30 = 5 hr average speed = 150 + 150/3 + 5 = 37.5 km/h
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