A car travels from A to B at 40 km/h and returns to A at 60 km/h. What is the average speed for the round journey? MCQ with Answer and Explanation

Explanation:
Downstream speed = 12 + 3 = 15 km/h. Time = 40 minutes = 40/60 = 2/3 hours. Distance = Speed * Time = 15 * (2/3) = 10 km.

Explanation:
Average Speed across sectors = 2xy / (x + y) = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.

Explanation:
Upstream speed = 12 / 4 = 3 km/h. Downstream speed = 16 / 2 = 8 km/h. Speed in still water = (Downstream speed + Upstream speed) / 2 = (8 + 3) / 2 = 5.5 km/h.