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The cost of running a bus from A to B, is Rs. `(av + b/v),` where `v` km/h is the average speed of the bus. When the bus travels at 30 km/h, the cost comes out to be Rs. 75 while at 40 km/h, it is Rs. 65.Then the most economical speed (in km/h) of the bus is :

A

45

B

50

C

60

D

40

Text Solution

Verified by Experts

The correct Answer is:
C
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