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Question

A car travels first 30 km with a uniform speed of 60 km h1 and then next 30 km with a uniform speed of 40 km h1. Calculate:

(i) the total time of journey,
(ii) the average speed of the car.

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Solution

(i) Time taken for first part of the journey, t1=d1v1=3060 h=0.5 h

Time taken for second part of the journey, t2=d2v2=3040 h=0.75 h

Total time, t=t1+t2=0.5+0.75=1.25 h

(ii) Average speed=Total distanceTotal time=30+301.25=48 kmph


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