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Question

A car travelled the first one-third of the distance d at a speed of 5 kmh1, the second one-third of the distance at a speed of 10 kmh1 and the last one-third of the distance at a speed of 15 kmh1. Determine the average speed of the car(in kmh1).

A
7.5
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B
8.18
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C
12
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D
13.5
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Solution

The correct option is B 8.18
Average speed =Total distance travelledTotal time taken

Average speed=d/3+d/3+d/3d/35+d/310+d/315
=dd15+d30+d45=8.18 km/h

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