Multiple choice

A train runs at 80 kmph for the first 40 km and the next 30 km at 60 kmph. Find the average speed.

  1. 62 kmph

  2. 64 kmph

  3. 65 kmph

  4. 70 kmph
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D Correct answer
Explanation

Average speed = Total distance / Total time. Total distance = 40 + 30 = 70 km. Time 1 = 40/80 = 0.5 hours. Time 2 = 30/60 = 0.5 hours. Total time = 1 hour. Average speed = 70 / 1 = 70 kmph.

AI explanation

The time taken for the first 40 km at 80 kmph is 0.5 hours, and the time taken for the next 30 km at 60 kmph is 0.5 hours. The total distance traveled is 40 plus 30, which equals 70 km, and the total time taken is 0.5 plus 0.5, which equals 1 hour. By the average speed formula, total distance divided by total time, the average speed is 70 kmph.

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