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?
Relative speed = 5.5 - 5 = 0.5 kmph [because they walk in the same direction]
distance = 8.5 km
time =$\dfrac{distance}{speed} = \dfrac{8.5}{0.5}$ = 17hr
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