SOLUTION: A motorboat goes 15 miles downstream at its top speed and then turns around and returns 15 miles upstream at its top speed. The trip upstream took twice as long as the trip downstr
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Question 1074159: A motorboat goes 15 miles downstream at its top speed and then turns around and returns 15 miles upstream at its top speed. The trip upstream took twice as long as the trip downstream. If the boats' top speed is 10 mph in still water, how fast is the current?
D=Rt rule is confused again.
Please help me with this.
Thank you. Answer by jorel1380(3719) (Show Source):
You can put this solution on YOUR website! Let c be the speed of the current. Then
15/10-c=2(15/10+c)
15/10-c=30/10+c
300-30c=150+15c
45c=150
c=3.3333 mph as the speed of the current. ☺☺☺☺
