SOLUTION: A motorboat can maintain a constant speed of 16mph relative to the water. The boat makes a trip upstream to a certain point in 20 minutes; the trip takes 15 minutes. What is the cu
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Question 678025: A motorboat can maintain a constant speed of 16mph relative to the water. The boat makes a trip upstream to a certain point in 20 minutes; the trip takes 15 minutes. What is the current's speed?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the speed of the current
= the boat's speed going upstream
= the boat's speed going downstream
given:
Going upstream:
(1)
Going downstream:
(2)
------------------------
Substitute (1) into (2)
Multiply both sides by
The current's speed is 2.286 mi/hr
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