SOLUTION: if it takes 3 hours to travel 15 miles downstream and 5 hours to travel upstream, how fast is the current if the speed of the boat remains constant?

Question 590923: if it takes 3 hours to travel 15 miles downstream and 5 hours to travel upstream, how fast is the current if the speed of the boat remains constant?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the speed of the boat
Let = the speed of the current
= the speed going downstream
= the speed going upstream
----------
Going downstream:

mi/hr
Going upstream:

mi/hr
-----------
Add these equations:

The speed of the boat is 4 mi/hr
check answer:

mi/hr
Going downstream:
r*t = d

Going upstream:

OK
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