[17 hrs] Two boys starting from the same place walk at a rate of 5kmph and 5.5kmphrespectively. What time

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

17 hrs

25 hrs

31 hrs

45 hrs

Explanation:

The relative speed of the boys = 5.5kmph – 5kmph
= 0.5 kmph
Distance between them is 8.5 km
Time= 8.5km / 0.5 kmph = 17 hrs

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