Multiple choice

A man travels at a speed of 47 kmph for 5.7 hours and 65 kmph for 5.5 hours. Find his average speed.

  1. 72 kmph

  2. 64 kmph

  3. 56 kmph

  4. 52 kmph
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Average speed = Total distance / Total time. Total distance = (47 * 5.7) + (65 * 5.5) = 267.9 + 357.5 = 625.4 km. Total time = 5.7 + 5.5 = 11.2 hours. Average speed = 625.4 / 11.2 = 55.839 kmph, which rounds to 56 kmph.

AI explanation

Using the standard average speed formula, total distance divided by total time, we first find the total distance by adding (47 times 5.7) and (65 times 5.5) to get 267.9 plus 357.5, which equals 625.4 km. The total time is 5.7 plus 5.5, which equals 11.2 hours. Dividing 625.4 by 11.2 yields an average speed of 56 kmph.

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