SOLUTION: ray packerd starts out on a boating trip at 8am. rays boat can go 20 mph in still water. how far downstream can ray go if the current is 5 mph and he wishes to go down and back in

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Question 954431: ray packerd starts out on a boating trip at 8am. rays boat can go 20 mph in still water. how far downstream can ray go if the current is 5 mph and he wishes to go down and back in 4 hours?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
d=distance
d%2F%2820mph%2B5mph%29%2Bd%2F%2820mph-5mph%29=4hrs
d%2F25mph%2Bd%2F15mph=4hrs
d%281%2F25mph%2B1%2F15mph%29=4hrs
d%283%2F75mph%2B5%2F75mh%29=4hrs
d%288%2F75mph%29=4hrs
d=4hrs%2875mph%2F8%29=%28300%2F8%29miles=37.5miles ANSWER: Ray could go 37.5 miles.
CHECK:
37.5mi%2F25mph%2B37.5mi%2F15mph=4hrs
1.5hrs%2B2.5hrs=4hrs
4hrs=4hrs