Multiple choice

A car travelled for 8 hours. If during the first 3 hours it travelled at a speed of 60 kmph, in the next 2 hours at 80 kmph and in the last 3 hours at 100 kmph, find its average speed.

  1. 105 kmph

  2. 90 kmph

  3. 80 kmph

  4. 75 kmph
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C Correct answer
Explanation

Average speed is total distance divided by total time. Total distance = (3*60) + (2*80) + (3*100) = 180 + 160 + 300 = 640 km. Total time = 8 hours. Average speed = 640 / 8 = 80 kmph.

AI explanation

Using the average speed formula of total distance divided by total time, first find the distances. The car travels 180 km in the first 3 hours (3 times 60), 160 km in the next 2 hours (2 times 80), and 300 km in the last 3 hours (3 times 100). The total distance is 640 km over 8 hours, so the average speed is 640 divided by 8, which is 80 kmph.

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