Multiple choice

What would be the approximate average speed of a car covering a distance of 440 m, if its speed while going to a place at 220 m was 70 m/sec and while coming back was 72 m/sec?

  1. 78 m/sec

  2. 75 m/sec

  3. 71 m/sec

  4. 67 m/sec

  5. 64 m/sec
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Average speed = Total distance / Total time. Total distance = 440 m. Time taken for first 220 m = 220/70 = 22/7 sec. Time taken for return 220 m = 220/72 = 55/18 sec. Total time = 22/7 + 55/18 = (396 + 385) / 126 = 781/126 sec. Average speed = 440 / (781/126) = 55440 / 781 approx 71 m/sec.

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