The consumption of diesel per hour of a bus varies directly as square of its speed. When the bus is travelling at 50 kmph its consumption is 1 litre per hour. if each litre costs $30 and other expenses per hous is $ 20, then what would be the minimum expenditure required to cover a distance of 400 Km?
Select the correct option.
A) 300	B) 400	C) 250	D) 350	E) 450
50 kmph consumption is 1 lt/hr   so 400 km will take 8 hrs and the consumption is 8 lt for entire distance.   1 lt costs $30   so 8 lt costs $240   extra expenses for 1 hr - $20   8 hrs - $160   total expense - $240 + $160= $400   Answer : 400
<result>B</result>
The consumption of diesel per hour of a bus varies directly as square of its speed. When the bus is travelling at 50 kmph its consumption is 1 litre per hour. if each litre costs $30 and other expenses per hous is $ 20, then what would be the minimum expenditure required to cover a distance of 400 Km?