The consumption of diesel per hour of a bus varies directly as square of its speed. When the bus is travelling at 60 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 600 Km? Select.
A) 500  B) 450  C) 600  D) 650  E) 750
60 kmph consumption is 1 lt/hr   so 600 km will take 10 hrs and the consumption is 10 lt for entire distance.   1 lt costs $30   so 10 lt costs $300   extra expenses for 1 hr - $20   10 hrs - $200   total expense - $300 + $200= $500   500nswer : 500
<result>A</result>
The consumption of diesel per hour of a bus varies directly as square of its speed. When the bus is travelling at 60 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 600 Km?