A boat travels 10km upstream and 5km
downstream in 3hrs. If the speed of the
boat in still water is 7kmph. Find the
speed of the stream.
Select one:
a. 1kmph
b. 1.5kmph
c. 2kmph
d. 3kmph
Answers
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1
Answer:
x=3kmph
Explanation:
let speed of boat in still water is y=7kmph
and the speed of running water be=xkmph
Let the speed of the stream be x kmph.
Upstream speed = (7-x) kmph
Downstream speed = (7+x) kmph .
Time taken to travel upstream = (10/(7-x)) hrs
Time taken to travel upstream = (5/(7+x)) hrs
Speed of the stream =>(10/(7-x)) + (5/(7+x)) = 3
3x2+5x-42=0
Solving this equation, x=3
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