SOLUTION: a boat heads upstream a distance of 30 miles on the missisippi river,whose current is running at 5 mph. if the trip back takes an hour less, what was the speed of the boat in still
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Question 342305: a boat heads upstream a distance of 30 miles on the missisippi river,whose current is running at 5 mph. if the trip back takes an hour less, what was the speed of the boat in still water? answer rounded to 2 decimal places if needed.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
You need 2 equations: 1 for upstream and 1 for downstream
Let rate of current =
Let rate in still water =
mi/hr
mi/hr
given:
mi
mi
mi/hr
hr
mi/hr
mi/hr
-----------------
and
By substitution:
Multiply both sides by
mi/hr
check answer:
hrs
hrs
this is wrong
OK
Something went wrong somewhere- answer doesn't
quite check. My method is good, though.
See if you can find error
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