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Two boys starts from the same place walking at the rate of 5 kmph and 5.5 kmph respectively in the same direction. What time will they take to be 8.5 km apart?

Correct answer: A. 17 hr

  • A. 17 hr
  • B. 14 hr
  • C. 12 hr
  • D. 19 hr

Explanation

Their relative speed is 5.5 kmph - 5 kmph = 0.5 kmph. The time to become 8.5 km apart is 8.5 km ÷ 0.5 kmph = 17 hours. The likely choice is b, 14 hours, from using an incorrect difference between their speeds.

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