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An automobile driver travels from plane ...

An automobile driver travels from plane to a hill station, a distance of 120 km at an average speed of 30 km per hour. He then makes the return trp at an average speed of 25 km per hour. He covers another 120 km distance on plane at an average speed of 50 km per hour. His average speed over the entire distance of 360 km will be :

A

`(3)/((1)/(30) + (1)/(25) + (1)/(50))`km/hr

B

`(30 + 25 + 50)/(3)` km/hr

C

`(30.25.50)^(1//3)` km/hr

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
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