SOLUTION: in a stream whose current flows at the speed of 3 km/hr ,a man rowed upstream and returned to his starting point in 6.25 hrs .If the man rows at a speed of 5 km/hr in still water,h

Question 473572: in a stream whose current flows at the speed of 3 km/hr ,a man rowed upstream and returned to his starting point in 6.25 hrs .If the man rows at a speed of 5 km/hr in still water,how long did he row upstream?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
in a stream whose current flows at the speed of 3 km/hr ,a man rowed upstream and returned to his starting point in 6.25 hrs .If the man rows at a speed of 5 km/hr in still water,how long did he row upstream?
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Upstream DATA:
time = t hrs ; rate = 5-3 km/h ; distance = 2t km
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Downstream DATA:
time = 6.25-t hrs ; rate = 5+3 km/h ; distance = 8(6.25-t) km
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Equation:
distance = distance
2t = 8(6.25-t)
10t = 50
t = 5 hr (time to row upstream)
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Cheers,
Stan H.

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