Two persons starting from the same place walk at a rate of 12kmph and 18kmph respectively. What time will they take to be 18km apart, if they walk in the same direction?
Options: A) 17 hrs B) 3 hrs C) 5 hrs D) 2 hrs E) 16 hrs
The relative speed of the boys = 18kmph – 12kmph   = 6 kmph   Distance between them is 18 km   Time= 18km / 6 kmph = 3 hrs   Answer : 3 hrs
<result>B</result>
Two persons starting from the same place walk at a rate of 12kmph and 18kmph respectively. What time will they take to be 18km apart, if they walk in the same direction?