In training for a competition, you find that swimming
downstream (with the current) in a river, you can swim 2
miles in 40 minutes, & upstream (against the current), you
can swim 2 miles in 60 minutes.
How long would it take you to swim a mile in still water?
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Answer Posted / guest
You are able to swim downstream at 3 miles an hour, &
upstream at 2 miles an hour. There is a difference of 1 mile
an hour, which is the river helping you in 1 direction, &
slowing you in the other direction.
Average the 2 rates, & you have the rate that you can swim
in still water, which is 2.5 miles an hour.
You can thus swim a mile in still water in 24 minutes.
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