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Question

# A car travels from A to B at a, speed of 20kmh−1 and returns at a speed of 30kmh−1. The average speed of the car for the whole journey is:5kmh−124kmh−125kmh−150kmh−1

A
5kmh1
B
24kmh1
C
25kmh1
D
50kmh1
Solution
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#### Let distance from A to B be xTime for travel from A to B= x/20Time for travel from B to A= x/30Hence,speed for total distance 2x is: 2xx30+x20=2x×605x=24 km\hr

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