A fisherman travels downstream at full speed to his favorite fishing spot. The stream is running at a rate of 5 miles per hour, and the trip takes 2 hours to get to the fishing hole. He is surprised, however, to find that the trip takes 6 hours at full speed to get back to the dock when he is finished. How fast will his fishing boat go?
Let the speed of the motor boat in still water be x mph
Then upstream speed = x - 5
and Downstream speed = x + 5
Distance = speed * Time
Distances are equal
==> 2(x + 5) = 6(x - 5)
==> 2x + 10 = 6x - 30
==> 40 = 4x
==> 10 = x
The boat’s speed in still water is 10 mph.
17.December, 2009 um 10:41 am
i have no idea but 2 miles per hour
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17.December, 2009 um 11:09 am
Let the speed of the motor boat in still water be x mph
Then upstream speed = x - 5
and Downstream speed = x + 5
Distance = speed * Time
Distances are equal
==> 2(x + 5) = 6(x - 5)
==> 2x + 10 = 6x - 30
==> 40 = 4x
==> 10 = x
The boat’s speed in still water is 10 mph.
References :
retired math teacher
17.December, 2009 um 11:25 am
This has nothing to do with astronomy. Why don’t you have someone "solve" your homework problem for you over in the math section
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17.December, 2009 um 11:52 am
<1% the speed of light.
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