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July 29, 2014

July 29, 2014

Posted by **john** on Sunday, July 22, 2012 at 11:20pm.

- math -
**Reiny**, Sunday, July 22, 2012 at 11:56pmlet the speed of the boat in still water be x mph

using Distance = rate x time or Time = distance/rate

upstream:

time = 26/(x-6)

downstream:

time = 52/(x+6)

26/(x-6) = 52/(x+6)

cross-multiply

52x - 312 = 26x + 156

26x = 468

x = 18

boat's speed is 18 mph

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