SOLUTION: Mark can row upstream at 5mph and downstream at 11 mph if mark starts rowing upstream until he gets tired and then rows downstream to his starting point how far did he row if the e

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: Mark can row upstream at 5mph and downstream at 11 mph if mark starts rowing upstream until he gets tired and then rows downstream to his starting point how far did he row if the e      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 841735: Mark can row upstream at 5mph and downstream at 11 mph if mark starts rowing upstream until he gets tired and then rows downstream to his starting point how far did he row if the entire trip took 4 hrs
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Mark can row upstream at 5mph and downstream at 11 mph if mark starts rowing upstream until he gets tired and then rows downstream to his starting point how far did he row if the entire trip took 4 hrs
***
let x=travel time upstream
4-x=travel time downstream
distance=travel time*speed
5x=11(4-x)
5x=44-11x
16x=44
x=44/16=11/4
4-x=16/4-11/4=5/4
5*11/4=55/4(distance upstream)
11*5/4=55/4(distance downstream)
2*55/4=55/2=27.5
how far did he row? 27.5 miles