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.
Pick.
A) 17 6/7 km/hr B) 25 km/hr C) 30 km/hr D) 35 km/hr E) 45 km/hr
Time taken = 1 hr 40 min 48 sec = 1 hr 40 4/5 min. = 126/75 hrs.   Let the actual speed be x km/hr.   Then, (5/7)x X 126/75 = 42   --&gt; x = 35 km/hr.   Answer : 35 km/hr.
<result>D</result>
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.