A starts 3min after B for a place 4.5 km distant B on reaching his destination immediately returns and after walking a km meets A. If A can walk 1km in 18min, then what is B's speed?  Choices:
A) 5kmph  B) 4kmph  C) 6kmph  D) 3.5kmph  E) 4.5kmph
If speed of B is x kms/min, then   (4.5+1)/x= [3.5/(1/18)] +3   x=1/12 km/min= 5 kms/hr   5kmphNSWER:5kmph
<result>A</result>
A starts 3min after B for a place 4.5 km distant B on reaching his destination immediately returns and after walking a km meets A. If A can walk 1km in 18min, then what is B's speed?