A car travelling with of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car. Choose the correct choice from the following answers:  A) 17 6/7 km/hr  B) 25 km/hr  C) 30 km/hr  D) 35 km/hr  E) 40 km/hr
Time taken = 1 hr 40 min 48 sec = 1 hr40 4/5min = 1 51/75hrs= 126/75hrs   Let the actual speed be x km/hr.   Then,5/7x X 126/75 =42   x = [42x7x75/5x126] = 35 km/hr   Answer is 35 km/hr
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A car travelling with of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.