SOLUTION: a motorboat took 2 hours to make a downstream trip with a 5mph current. The return trip against the same current took 4 hours. Find the speed of the boat in still water.
Algebra.Com
Question 243576: a motorboat took 2 hours to make a downstream trip with a 5mph current. The return trip against the same current took 4 hours. Find the speed of the boat in still water.
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
D=RT
D=(X+5)*2
D=(X-5)*4
(X+5)*2=(X-5)*4
2X+10=4X-20
2X-4X=-20-10
-2X=-30
X=-30/-2
X=15 MPH IS THE SPEED OF THE BOAT IN STILL WATER.
PROOF:
(15+5)*2=(15-5)*4
20*2=10*4
40=40
RELATED QUESTIONS
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)
Traveling upstream against the current, it took a motorboat 2 hours to make a 60-mile... (answered by solver91311,josmiceli)
Traveling upstream against the current, it took a motorboat 2 hours to make a 60 mile... (answered by ewatrrr)
a motorboat took 2 hours to make a downstream trip witha 5 mph current. the return trip... (answered by josmiceli)
Christina’s motorboat took 3 hours to make a trip downstream with a 6-mph current. The... (answered by mananth)
A motor Boat took 4 hours to make a downstream trip with a current of 3mph. The return... (answered by jorel1380)
Mia's motorboat took 3 hours to make a trip downstream with a 6 mph current. the return... (answered by stanbon)
Mia's motorboat took 3hr. to make a trip downstream with a 6-mph current. The return trip (answered by solver91311)