Homework Help: math urgent

Posted by mandy on Monday, November 29, 2010 at 11:21pm.

a motorboat takes 4 hrs to travel 256 miles going upstream. the return trip takes 2 hours going down stream. what is the rate of the boat in still water and what is the rate current.

rate of the boat in still water=mi/hr
rate of the current=mi/hr

math urgent - Reiny, Monday, November 29, 2010 at 11:30pm
rate in still water --- x mph
raate of current ---- y mph

#1: 4(x-y) = 256
x-y = 64

#2: 2(x+y) = 256
x+y = 128

add them .....

I will let you finish, let me know what you get.

(BTW, the rates seem very unreasonable as you will see)
math urgent - Anonymous, Thursday, December 9, 2010 at 7:55am
8...? not sure..
math urgent - Anonymous, Thursday, December 9, 2010 at 8:09am
96...? ahah..
still unsure.

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