Q 2645101963.     A truck is to be driven `300` km on a highway at a constant speed of `x` kmph. Speed rules of the highway
required that `30 le x le 60`. The fuel costs Rs. `10` per litre and is consumed at the rate of `2 + (x^2)/600` litres
per hour. The wages of the driver are Rs. `200` per hour. The most economical speed to drive the truck,
in kmph, is

A

`30`

B

`60`

C

`30 sqrt (3.3 )`

D

`20 sqrt (3.3)`

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