Two persons starting from the same place walk at a rate of 4kmph and 5.5kmph respectively. What time will they take to be 9km apart, if they walk in the same direction? Choose the correct choice from the following:
A) 6 hrs	B) 22 hrs	C) 25 hrs	D) 12 hrs	E) 14 hrs
The relative speed of the boys = 5.5kmph â€“ 4kmph   = 1.5 kmph   Distance between them is 9 km   Time= 9km / 1.5 kmph = 6 hrs   6 hrsnswer : 6 hrs.
<result>A</result>
Two persons starting from the same place walk at a rate of 4kmph and 5.5kmph respectively. What time will they take to be 9km apart, if they walk in the same direction?