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.

17 6 km/hr 7
25 km/hr
30 km/hr
35 km/hr

Correct Answer: 35 km/hr

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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