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 ?

– by 0

A. 19 hr
B. 17 hr
C. 4 hr
D. 12 hr

Relative speed = 5.5 – 5 = .5 kmph (because they walk in the same direction)
distance = 8.5 km

time = distance/speed=8.5/.5=17 hr

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