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?
Choose the correct choice from the following answers
A) 17
B) 88
C) 21
D) 26
E) 18
Relative speed = 5.5 - 5= 
<gadget id="calculator">5.5 - 5</gadget>
<output>0.5</output>
.5 kmph (because they walk in the same direction)   distance= 8.5 km   time = distancespeed=8.5.5=17 hr   17nswer :17
<result>A</result>
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?