Multiple choice

What would be the average speed of a car covering a distance of 320 m, if its speed while covering the first 160 m was 64 m/sec and for the other 160 m was 80 m/sec?

  1. 71.11 m/sec

  2. 75.09 m/sec

  3. 80.1 m/sec

  4. 82.5 m/sec

  5. 85.2 m/sec
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A Correct answer
Explanation

Average speed = Total distance / Total time. Time1 = 160/64 = 2.5s. Time2 = 160/80 = 2s. Total time = 4.5s. Average speed = 320 / 4.5 = 71.11 m/s.

AI explanation

Using the formula for average speed when equal distances are covered at different speeds, 2xy divided by (x + y), we get 2 multiplied by 64 and 80, divided by the sum of 64 and 80. This yields 10240 divided by 144, which simplifies to 71.11 m/sec.

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