Question 746167
Keisha rowed downstream for 5 miles and back upstream for 3 miles. She rowed an average of 3 times the rate of the current. Write an expression for her total time.


let current speed be r
rowing speed = 3r

speed up stream = 3r-r=2r
speed down stream = 3r+r=>4r

time down stream = d/r => 5/4r

time upstream = 3/2r

Total time

{{{5/4r+3/2r}}}