Multiple choice

Ram covered 20% of his journey at 40 km/hr and the remaining journey at 50 km/hr. Find his average speed.

  1. 47.62 km/hr

  2. 50.32 km/hr

  3. 45.36 km/hr

  4. 52.16 km/hr

  5. None of these
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A Correct answer
Explanation

Average speed = Total Distance / Total Time. Let total distance be 100 km. 20 km at 40 km/hr (0.5 hr) and 80 km at 50 km/hr (1.6 hr). Total time = 2.1 hr. Average speed = 100 / 2.1 = 47.619 km/hr.

AI explanation

Assume the total journey distance is 100 km, meaning 20 km is covered at 40 km/hr and 80 km is covered at 50 km/hr. The time taken for the first part is 20 divided by 40, which is 0.5 hours. The time for the second part is 80 divided by 50, which is 1.6 hours. The average speed equals total distance divided by total time, giving 100 divided by 2.1, which equals 47.62 km/hr.

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