SOLUTION: Q25- A motorboat can maintain a constant speed of 16 miles per hour relative to the water.The boat makes a trip upstream to a certain point in 20 minutes; the return trip takes 15

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Question 156525This question is from textbook Sullivan, college algebra
: Q25- A motorboat can maintain a constant speed of 16 miles per hour relative to the water.The boat makes a trip upstream to a certain point in 20 minutes; the return trip takes 15 minutes.What is the speed of the current?
Q33- Working together on a job. Trent can deliver his newspapers in 30 minutes.It takes Lois 20 minutes to do the same rout.How long would it take them to deliver the newspapers if they work together This question is from textbook Sullivan, college algebra

Answer by checkley77(12844)   (Show Source): You can put this solution on YOUR website!
d=r*t
d=(16-c)*20
d=(16+c)*15
(16-c)*20=(16+c)*15
320-20c=240+15c
-20c-15c=240-320
-35c=-80
c=-80/-35
c=2.285 mph is the speed of the current.
Proof:
(16-2.285)*20=(16+2.285)*15
13.715*20=18.285*15
274.3=274.3
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