Question 333627: Bill swims at a speed of 6.7 mph in still water. The river he's in flows at a at speed of 3.6 mph. How long will it take Bill to swim 1.3 mi upstream?Round your
answer to the nearest tenth of an hour, if necessary.
Answer by jrfrunner(365)   (Show Source):
You can put this solution on YOUR website! Bill swims at a speed of 6.7 mph in still water. The river he's in flows at a at speed of 3.6 mph. How long will it take Bill to swim 1.3 mi upstream?
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You need to understand the relationship:
d=r*t (distance = rate*time)
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Since you need to find time,rework this formula to find time (t=d/r)
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you are given the distance d = 1.3 miles
The speed is the "net speed" he travels during this distance.
Since he is swimming upstream, he is fighting the river flow
Therefore, his net speed is his speed in still water minus the river flow
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net speed: (Bill's speed - river flow)==> r = 6.7mph - 3.6 mph = 3.1 mph
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time to swim 1.3 miles: t = d/r =1.3 miles /3.1 mph = 0.419 hours or 0.4 hour rounded to nearest tenth of an hour
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