SOLUTION: Bill rows his boat at 10 miles per hour. He rowed 20 miles down a stream and then rowed back to his starting point the stream is flowing at 2 mikes per hour how many hours and min

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Question 1069573: Bill rows his boat at 10 miles per hour. He rowed 20 miles down a stream and then rowed back to his starting point the stream is flowing at 2 mikes per hour how many hours and minutes did it take him
Found 2 solutions by ikleyn, stanbon:
Answer by ikleyn(52777)   (Show Source): You can put this solution on YOUR website!
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Bill rows his boat at 10 miles per hour. He rowed 20 miles down a stream and then rowed back to his starting point
the stream is flowing at 2 mikes per hour how many hours and minutes did it take him
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Bill's speed traveling downstream is 10 + 2 = 12 miles per hour.

So, it took 

 =   =   of an hour = 1 hour and 40 minutes

to row 20 miles downstream.



Bill's speed traveling upstream is 10 - 2 = 8 miles per hour.

So, it took 

 =   =   of an hour = 2 hours and 30 minutes

to row 20 miles upstream.



The entire round trip took 4 hours and 10 minutes.


Answer by stanbon(75887)   (Show Source): You can put this solution on YOUR website!
Bill rows his boat at 10 miles per hour. He rowed 20 miles down a stream and then rowed back to his starting point the stream is flowing at 2 mikes per hour how many hours and minutes did it take him.
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Downstream::
dist = 20 miles ; rate = 10+2 mph ; time = 20/12 = 1 2/3 hrs
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Upstream::
dist = 20 miles ; rate = 10-2 mph ; time = 20/8 = 2 1/2 hrs
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Ans: 5/3 + 5/2 = (10+15)/6 = 25/6 = 4 1/6 hrs = 4*60+10 = 250 minutes
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Cheers,
Stan H.
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