A car travelling with 5/7 of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.

1.

A car travelling with 1-div-5by7 of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.

[A].	17 6/7 km/hr
[B].	25 km/hr
[C].	30 km/hr
[D].	35 km/hr

Answer: Option D

Explanation:

Time taken = 1 hr 40 min 48 sec = 1 hr 40	4	min = 1	51	hrs =	126	hrs.
	5		75		75

Let the actual speed be x km/hr.

Then,	5	x x	126	= 42
	7		75

x =		42 x 7 x 75		= 35 km/hr.
		5 x 126

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