The cost of running a bus from A to B, is Rs. \[\left( av+\frac{b}{v} \right),\] 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:

The cost of running a bus from A to B, is Rs. \[\left( av+\frac{b}{v}

1.	The cost of running a bus from A to B, is Rs. \[\left( av+\frac{b}{v} \right),\] 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
Answer» D. 40

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The cost of running a bus from A to B, is Rs. \[\left( av+\frac{b}{v} \right),\] 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:

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