A person travels a distance of 200 km at an average speed of 50 km/h and returns at a speed of 40 km/h. Find the average speed for the round trip. MCQ with Answer and Explanation

Explanation:
Total time for full trip = 240 / 60 = 4 hours. Time spent on first 120 km = 120 / 40 = 3 hours. Remaining time for the last 120 km = 4 - 3 = 1 hour. Required speed = 120 km / 1 hour = 120 km/h.

Explanation:
Downstream speed = 42 / 2 = 21 km/h. Upstream speed = 42 / 3 = 14 km/h. Speed of current = (Downstream speed - Upstream speed) / 2 = (21 - 14) / 2 = 7 / 2 = 3.5 km/h.

Explanation:
Distance = 40 * 6 = 240 km. New required speed = 240 / 4 = 60 km/h.