A car covers four successive three km stretches at speeds of 10km/hr, 20 km/hr, 30 km/hr respectively. Its average speed over this distance is:

A car covers four successive three km stretches at speeds of 10km/h

1.	A car covers four successive three km stretches at speeds of 10km/hr, 20 km/hr, 30 km/hr respectively. Its average speed over this distance is:
A.	10 km/hr
B.	20 km/hr
C.	30km/hr
D.	25km/hr
Answer» C. 30km/hr

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A car covers four successive three km stretches at speeds of 10km/hr, 20 km/hr, 30 km/hr respectively. Its average speed over this distance is:

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