Multiple choice

Mr. Ravi completes a certain journey by a car. If he covered 40% of the distance at the speed of 20kmph, 50% of the distance at 25 kmph and the remaining of the distance at 10 kmph, then what will be the speed?

  1. 15 kmph

  2. 20 kmph

  3. 18 kmph

  4. 14 kmph

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The average speed is calculated as Total Distance / Total Time. Let the total distance be 100 km; the times are 40/20 = 2 hours, 50/25 = 2 hours, and 10/10 = 1 hour, totaling 5 hours. Average speed = 100 / 5 = 20 kmph.

AI explanation

Assume the total distance of the journey is 100 km, meaning he covers 40 km at 20 kmph, 50 km at 25 kmph, and the remaining 10 km at 10 kmph. Using the formula time equals distance divided by speed, the time taken for the three parts is 2 hours, 2 hours, and 1 hour respectively. The total time taken for the entire journey is 5 hours. The average speed is total distance divided by total time, which is 100 divided by 5, equaling 20 kmph.

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