A car moves up as hill of incline 1 in 5...

A car moves up as hill of incline 1 in 50 with a velocity of 15 KMPH. The resistance due to friction is `(1)/(25)th` of weight of the car. The speed of the car while moving down hill using same power is

15 KMPH

30 KMPH

45 KMPH

60 KMPH

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