SOLUTION: by boat, joseph can go 72km upstream to a fishing hole in 4 hours. to go back, he needs only 3 hours. what is his rate upstream and his rate downstream?

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Question 150587: by boat, joseph can go 72km upstream to a fishing hole in 4 hours. to go back, he needs only 3 hours. what is his rate upstream and his rate downstream?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
rt=d
r=d/t
72/4=18 km/h rate upstream
72/3=24 km/h rate downstream
.
Ed