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Q.

A car covers four successive 7 km distances at speeds of 10 km/hour, 20 km/hour, 60 km/hour respectively. Its average speed over this distance is

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a

60 km/hour

b

40 km/hour

c

30 km/hour

d

20 km/hour

answer is B.

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Detailed Solution

$Average speed = \frac{7 + 7 + 7 + 7}{\frac{7}{10} + \frac{7}{20} + \frac{7}{30} + \frac{7}{60}} = 20 km / hr$

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