Posted by **Rebecca** on Wednesday, January 4, 2012 at 3:34pm.

Toni rows a boat 4.5km/h upstream and then turns around and rows 5.5km/h back to her starting point. If her total rowing time is 48 min , for how long does she row upstream?

- 7th Grade Math -
**Steve**, Wednesday, January 4, 2012 at 4:40pm
the distances are hew same, though unknown.

let the distance be d. time = distance/speed. Add up the times:

d/4.5 + d/5.5 = .8

10d = 19.8

d = 1.98km

d/4.5 = .44hour

d/5.5 = .36hour

total = .80 hour = 48 min.

- 7th Grade Math -
**TutorCat**, Wednesday, January 4, 2012 at 4:41pm
Distance= rate*time

Distance upstream = distance downstream

Time should be converted to hour b/c the units for rate is in /hour. We know the total time so assign one of the times x (upstream time b/c you would only have to solve for x to get its time) and the other the total time in hour-x.

## Answer this Question

## Related Questions

- Math - Toni rows a boat 4.5 km/h upstream and then turns around and rows 5.5 km/...
- algebra - rowing. Abby rows 10 km upstream and 10 km back in a total time of 3 ...
- math - Rowing. Abby rows 10 km upstream and 10 km back in a total time of 3 hr. ...
- intermediate algebra - Rowing. Abby rows 10km. upstream and 10km. back in a ...
- applications involving quadratic - Abby rows 10 km upstream and 10 km back in a ...
- Algebra - A boy can row a boat at a constant rate of 5 mi/hr in still water. He ...
- math - Mr. Tip is working on the marching band's halftime show. During the first...
- algebra - could you please show me how to do this problem? Bob rows 6 miles ...
- Physics - A boat is to be driven from a point on the South bank of a river which...
- College Algebra - A boy can row a boat at a constant rate of 5 mi/hr in still ...