-----Original Message----- From: lbo-talk-bounces at lbo-talk.org [mailto:lbo-talk-bounces at lbo-talk.org] On Behalf Of Wojtek Sokolowski Sent: Thursday, February 23, 2006 10:00 AM To: lbo-talk at lbo-talk.org Subject: RE: [lbo-talk] math problem...
Speed = distance/time
R= current speed 5r = boat speed T = time
Travel speed downstream = 5r+r = 375/(t+1) Travel speed upstrean = 5r-r=225/t R= 375/(6t+6) R=225/4t 225/4t = 375/(6t+6)
Solve for T and then plug in T into R=225/t to determine R and then the speed of the boat = 5r.