Multiple choice

A train covers a distance of 80 km; the first 60 km at a speed of 40 km/hr and the remaining distance at a speed of 20 km/hr. What is the average speed of the train during the journey?

  1. 32 km/hr

  2. 30 km/hr

  3. 25 km/hr

  4. 28 km/hr

  5. None of these
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A Correct answer
Explanation

First 60 km at 40 km/hr takes 1.5 hours. Remaining 20 km at 20 km/hr takes 1 hour. Total time = 2.5 hours. Average speed = 80 / 2.5 = 32 km/hr.

AI explanation

The total time for the journey is calculated by adding the time for the first 60 km (60 divided by 40, which is 1.5 hours) and the time for the remaining 20 km (20 divided by 20, which is 1 hour). The total time is 2.5 hours for the 80 km journey. Using the average speed formula of total distance divided by total time, 80 divided by 2.5 gives 32 km/hr.

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