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A car travelling with 57 of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.

A. 1767 km/hr

B. 25 km/hr

C. 30 km/hr

D. 35 km/hr

Correct Answer : D.


Time taken = 1 hr 40 min 48 sec = 1 hr 4045 min = 15175 hrs = 12675 hrs.
Let the actual speed be x km/hr.
Then, 57x × 12675 = 42
⇒x=42×7×755×126=35 km/hr

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