Two boys starting from the same place walk at a rate of 5kmph and 5.5kmph respectively. What time will they take to be 10km apart, if they walk in the same direction? Choose the correct choice from the following options:
A) 15 hours	B) 16 hours	C) 17 hours	D) 18 hours	E) 20 hours
The relative speed of the boys = 5.5kmph â€“ 5kmph   = 0.5 kmph   Distance between them is 10 km   Time = Distance/Speed   Time= 10km / 0.5 kmph = 20 hrs   answer :20 hours
<result>E</result>
Two boys starting from the same place walk at a rate of 5kmph and 5.5kmph respectively. What time will they take to be 10km apart, if they walk in the same direction?