If a boat goes upstream at 5 km/hr and downstream at 7 km/hr what is the speed of the stream?
Choose the correct choice from the following choices.
A) 1.5 kmph B) 1.2 kmph C) 1.1 kmph D) 1.3 kmph E) 1 kmph
Sol.   Speed of stream = 1/2(7 -5) kmph = 1 kmph.   Answer 1 kmph
<result>E</result>
If a boat goes upstream at 5 km/hr and downstream at 7 km/hr what is the speed of the stream?