Posted by **Joel** on Tuesday, February 22, 2011 at 9:08am.

Cody’s motorboat took 3 hr to make a trip downstream with a 6-mph current. The return trip against the same current took 5 hr. Find the speed of the boat in still water

- Algebra -
**Anonymous**, Tuesday, February 22, 2011 at 9:24am
Time= distance*velocity

3=d*(vb+vs)

5=d(Vb-vs)

3/d= vb+Vs

5/d=Vb-Vs

add the equations

3/d + 5/d=2Vb

5d+3d=30Vb

solve for Vb

- Algebra -
**Reiny**, Tuesday, February 22, 2011 at 9:27am
speed of boat in still water ---- x mph

distance going upstream = 5(x-6)

distance going downstream = 3(x+6)

Are the distances not equal ?

## Answer this Question

## Related Questions

- word problem - A motor boat took 4 hours to make a downstream trip with a ...
- math 116 - A Coast-Guard patrol boat travels 4 hr on a trip downstream with a 6-...
- Math - A boat crew rowed 20 miles downstream, with the current, in 2hours. The ...
- MATH - 1. A boat traveled 210 miles downstream and back. The trip downstream ...
- Help...More Math Help!!!...Please! - A kayaker paddled 2 hours with a 6 mph ...
- algebra - A motorboat traveling a distance of 225 miles in 5 hours while ...
- Algebra - A boat's crew rowed 7.5 downstream,with the current, in 1.5 hours. The...
- algebra - A boat's crew rowed 13.5 miles downstream, with the current, in 1.5 ...
- Math - It took a boat 6 h to travel 84 km up a river against the current but ...
- algebra - HOW DO SOLVE A BOAT TRAVELED 336 MILES DOWNSTREAM AND BACK. THE TRIP ...

More Related Questions