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 bus travelling the first one third distance at a speed of 10 km/h, the next one third at 20 km/h and the last one third at 60 km/h. The average speed (in km /h) of the bus is

If the average speed of a bus is 52 ""km / h . How long does it take to travel 520 kilometres at this speed?

If the average speed of a bus is 52 ""km / h . How much does it travel in 6 hours?

A bus traveling the first one-third distance at a speed of 10 km/h, the next one-fourth at 20- km/h and the remaining at 40 km/h. The average speed of the bus is nearly

A bus traveling the first one-third distance at a speed of 10 km/h, the next one-fourth at 20- km/h and the remaining at 40 km/h. The average speed of the bus is nearly

The cost of fuel for running a bus is proportional to the square of the speed generated in km/h. It cost Rs 48 per hour when the bus is moving with a speed of 20 km/h. What is the most economical speed if the fixed charges are Rs 108 for one hour, over and above the running charges?

The fuel charges for running a train are proportional to the square of the speed generated in km/h, and the cost is Rs. 48 at 16 km/h. If the fixed charges amount to Rs. 300/h, the most economical speed is 60 km/h (b) 40 km/h 48 km/h (d) 36 km/h

A bus travels 700 km at a certain speed. If the bus driver reduces the speed of bus to 20 km/h then the bus will take four hours more to travel the same distance. Then find the initial speed of the bus ?