Posted by **marie** on Thursday, June 22, 2006 at 9:11pm.

A motor boat took 4 hours to make a downstream trip with a current of 3mph. The return trip against the same current took 8 hours. Find the speed of the boat in still water.

Call Y the boat's rate.

distance = rate x time.

downstream rate of boat is Y+3. t=4 hrs.

upstream rate of boat is Y - 3. t=8 hrs.

d(downstream) = (Y+3)4

d(upstream) = (Y-3)8

The distance is the same so set them equal to each other and solve for Y.

Thank you

## Answer this Question

## Related Questions

- Algebra - Cody’s motorboat took 3 hr to make a trip downstream with a 6-mph ...
- Algebra - 5.) A boat makes a trip downstream in 5 hours. The return trip against...
- Algebra 2 - 5.) A boat makes a trip downstream in 5 hours. The return trip ...
- MATH - 1. A boat traveled 210 miles downstream and back. The trip downstream ...
- algebra - HOW DO SOLVE A BOAT TRAVELED 336 MILES DOWNSTREAM AND BACK. THE TRIP ...
- Algebra - A boat's crew rowed 7.5 downstream,with the current, in 1.5 hours. The...
- Algerbra - A boat's crew rowed 10.5 miles downstream, with the current, in 1.5 ...
- algebra - A boat's crew rowed 13.5 miles downstream, with the current, in 1.5 ...
- math - A boat traveled 210 miles downstream and back. The trip downstream took ...
- Math - A boat travels 12 miles up a river, then returns to where it started. The...

More Related Questions