3811. 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. 38 km/hr
- B. 15 km/hr
- C. 35 km/hr
- D. 25 km/hr
Check answer and explanation
Answer: 35 km/hr
Explanation Speed with which the car travels = 5/7th of its actual speed. Distance covered = 42 km Time taken to cover the above distance = 1 hour 40 minutes 48 seconds = 1 hr 40 (4/5) min = 126/75 hrs To find: The actual speed of the car = ? Solution: Let the actual speed of the car be x km/hr Then, (5/7)x *(126/75) = 42 x = (42 * 7 * 75)/(5 * 126) x = 35 km/hr