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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.

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

Answer and Explanation

Answer:35 km/hr

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

Let the actual speed be x km/hr.
Then, 5/7 x * 126/75 = 42

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

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