Average Practice Test 2

Question : 2 of 40

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The average speed of a car which covers half the distance with a speed of 20 km/h and the other half with the speed of 30 km/h will be:

Solution:

Let the total distance = 2x km.
Average speed of car in the first half = 20 x km/h.
Average speed of car in the second half

=x/30

km/h
Average speed

={2x}/{x/20+x/30}={2x×60}/{5x}

= 24 km/h.

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