Two persons starting from the same place walk at a rate of 10kmph and 12.5kmph respectively. What time will they take to be 10km apart, if they walk in the same direction?	Choose the most appropriate option
A) 17 hrs	B) 4 hrs	C) 6 hrs	D) 12 hrs	E) 16 hrs
The relative speed of the boys = 12.5kmph – 10kmph   = 2.5 kmph   Distance between them is 10 km   Time= 10km / 2.5 kmph = 4 hrs   Answer : 4 hrs
<result>B</result>
Two persons starting from the same place walk at a rate of 10kmph and 12.5kmph respectively. What time will they take to be 10km apart, if they walk in the same direction?