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−1
24kmh−1
25kmh−1
50kmh−1
A
24kmh−1
B
25kmh−1
C
5kmh−1
D
50kmh−1
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Solution
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Let distance from A to B be x Time for travel from A to B= x/20 Time for travel from B to A= x/30 Hence,speed for total distance 2x is: 2xx30+x20=2x×605x=24 km\hr
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