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It's not 21...
it depends on the direction of the boat - if it travels with the current then its speed is 25 mph
if it is travelling in the opposite direct ( against the current) then its speed is 21 mph. that is its speed relative to the bank.
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Well, I'm doing a problem where I have to solve...
"If a boat that travels 23 miles per hour in still water is traveling with a current that has a rate of 2 miles per hour, how far will the boat travel in 3 hours? "
And I thought the answer would be 63, because against the current the boat travels 21 and...oh wait i just saw it! oh, silly me...thank you, you are correct crcrw238...that's my mistake, the word problem said WITH the current, and I totally skipped that.