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

A car covers four successive 7 km distances at speeds of 10 km/hour, 2

1.	A car covers four successive 7 km distances at speeds of 10 km/hour, 20 km/hour, 30 km/ hour and 60 km/hour respectively. Its average speed over this distance is
A.	30 km/hour
B.	20 km/hour
C.	60 km/hour
D.	40 km/hour
Answer» C. 60 km/hour

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

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