A car covers a specific distance path at an average speed of 40 km/h and returns along the same course layout at 60 km/h. Find the average speed for the round journey. MCQ with Answer and Explanation
A car covers a specific distance path at an average speed of 40 km/h and returns along the same course layout at 60 km/h. Find the average speed for the round journey.
Explanation:
Let each third segment distance be 60 km. Total distance = 180 km. Total time taken = 60/10 + 60/20 + 60/60 = 6 + 3 + 1 = 10 hours. Average speed across route = 180 / 10 = 18 km/h.
Two express trains 200 meters and 150 meters long are moving in the same direction at 72 km/h and 54 km/h respectively. Find the time taken by the faster train to cross the slower train completely.
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