Saturday

December 20, 2014

December 20, 2014

Posted by **sam** on Saturday, April 24, 2010 at 8:05pm.

The crew's rowing rate in still water is ??? mile(s) per hours.

The rate of the currents is ??? mile(s) per hour.

Please HELP, this question is hard, and I don't understand it.

- math -
**Reiny**, Saturday, April 24, 2010 at 10:18pmLet the rowing rate be x mph

let the current's rate by y mph

going with the current, will be a rate of x+y mph

going against the current would be x-y mph

so you get two equations, using Distance = rate x time

1.5(x+y) = 12

4(x-y) = 12

1st: divide by 1.5

---> x+y = 8

2nd: divide by 4

---> x-y = 3

add them

2x = 11

x = 5.5 mph

back in 1st, y = 2.5 mph

so the rowing speed is 5.5 mph,

the current's speed is 2.5 mph

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