SOLUTION: The speed of a stream is 3 km/hr. A boat traveled up stream 4 km in the same time it took to travel 10 km down stream. What was the speed of the boat on still water? I can't fig
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Question 270602: The speed of a stream is 3 km/hr. A boat traveled up stream 4 km in the same time it took to travel 10 km down stream. What was the speed of the boat on still water? I can't figure out how to work this without a time.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = speed of stream in km/hr
Let = speed of boat in still water in km/hr
Upstream:
Downstream:
given:
km/hr
km
km
(I'll just call it )
-------------------------------------------
(1)
(1)
and
(2)
(2)
Since is the same in both,
Multiply both sides by
The speed of the boat on still water is 7 km/hr
check:
(1)
(1)
(1)
hr
and
(2)
(2)
(2)
hr
OK
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