SOLUTION: a motor boat took 3 hours to make a downstream trip with a 4 mph current. The return trip against the same current took 5 hours. Find the speed of the boat in still water.

Question 415075: a motor boat took 3 hours to make a downstream trip with a 4 mph current. The return trip against the same current took 5 hours. Find the speed of the boat in still water.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
let speed in still water = x
current speed = 4
..
upstream speed = x-4
downstream speed = x+4
..
upstream time = 4 hours
downstream time = 3 hours
..
Distance = same
4(x-4)=3(x+4)
4x-16=3x+12
4x-3x=12+16
x= 28 miles distance
RELATED QUESTIONS
A motor Boat took 4 hours to make a downstream trip with a current of 3mph. The return... (answered by jorel1380)

a motor boat toook 3 hours to make a downstream trip with a 6 km/h current the return... (answered by sophiainman,stanbon)

Mia's boat took 3 hours to make a trip downstream with a 6 mph current. The return trip... (answered by stanbon)

Christina�s motorboat took 3 hours to make a trip downstream with a 6-mph current. The... (answered by mananth)

Mia's boat took 3 hr to make a trip downstream with a 6 mph current. The return trip... (answered by solver91311)

Mia's motorboat took 3 hours to make a trip downstream with a 6 mph current. the return... (answered by stanbon)

A motorboat took 3 hours to make a downstream trip with a current of 6km/h. The return... (answered by orca)

A motorboat took 3 hours to make a downstream trip with a 6km/h current. The return trip... (answered by ankor@dixie-net.com)

a motorboat took 2 hours to make a downstream trip witha 5 mph current. the return trip... (answered by josmiceli)