Two persons 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?	Choose the correct choice from the following options.
A) 17 hrs  B) 22 hrs  C) 25 hrs  D) 12 hrs  E) 14 hrs
The relative speed of the boys = 5.5kmph – 5kmph   = 0.5 kmph   Distance between them is 8.5 km   Time= 8.5km / 0.5 kmph = 17 hrs   17 hrsnswer : 17 hrs.
<result>A</result>
Two persons 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?