A Motor Boat whose speed in still water is 18km/hr 1 hour more to go 24km upstream that to return down stream to the same spot. Find the speed the stream?
Aduvet12:
Excuse me sir, how much time does it take to go downstream.
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so the answer is 1hr 20min
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Answer:
Let the speed of stream be x km / hr
For upstream = ( 18 - x ) km / hr
For downstream = ( 18 + x ) km / hr
A.T.Q.
24 / 18 - x - 24 / 18 + x = 1
48 x = 324 - x²
x² + 48 x - 324 = 0
( x + 54 ) ( x - 6 ) = 0
x = - 54 or x = 6
Since speed can't be negative .
Therefore , speed of the stream is 6 km / hr .
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