A bus covers four successive 3 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 bus covers four successive 3 km stretches at speed of 10 km/hr, 20 k

1.	A bus covers four successive 3 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.	30 km/hr
B.	25 km/hr
C.	20 km/hr
D.	10 km/hr
Answer» D. 10 km/hr

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A bus covers four successive 3 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

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