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? Options.
A) 15 hours	B) 16 hours	C) 17 hours	D) 18 hours	E) None of these
Explanation:   In this type of questions we need to get the relative speed between them,   The relative speed of the boys = 5.5kmph � 5kmph   = 0.5 kmph   Distance between them is 8.5 km   Time = Distance/Speed   Time= 8.5km / 0.5 kmph = 17 hrs   Answer: 17 hours
<result>C</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 8.5km apart, if they walk in the same direction?