A car covers four successive three km stretches at speed of 10 km/hr, 20 km/hr, 30 km/hr and 60 km/hr. respectively. Its average speed over this distance is ?

A car covers four successive three km stretches at speed of 10 km/hr,

1.	A car covers four successive three km stretches at speed of 10 km/hr, 20 km/hr, 30 km/hr and 60 km/hr. respectively. Its average speed over this distance is ?
A.	10 km/hr.
B.	20 km/hr .
C.	30 km/hr.
D.	25 km/hr .
Answer» C. 30 km/hr.

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