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A car covers four successive 7 km distances at speeds of 10 km/hour, 20 km/hour, 30 km/hr, 60 km/hour respectively. Its average speed over this distance is
40 km/hour
20 km/hour
60 km/hour
30 km/hour
average speed=7+7+7+7/7/10+7/20+7/30+7/60
=20km/hr
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