In a ship race Hana completed 20 km downstream in 3 hr. If the return trip took 4 hr 20 min, how fast can
she paddle in still water?

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d = rt
20 = 3(r+w)
20 = (13(r+w))/3

Yes, this is what I did and then got a negative answer!

well, the second equation is supposed to be r - w for upstream

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