Calculate the speed of a stream if a boat going upstream at
4km/hr and downstream at 8km/hr	Choose the correct choice from the following answers:
A) 1 kmph  B) 2 kmph  C) 3 kmph  D) 6 kmph  E) 8 kmph
Sol.   Speed of stream = 1/2(8 -4) kmph = 2 kmph.   Answer 2 kmph
<result>B</result>
Calculate the speed of a stream if a boat going upstream at
4km/hr and downstream at 8km/hr