Friday

January 30, 2015

January 30, 2015

Posted by **Analica** on Thursday, March 15, 2012 at 9:46pm.

- Math -
**Steve**, Friday, March 16, 2012 at 11:50amstill-water speed: s

river speed: r

45 = 5(s-r) = 3(s+r)

5s - 5r = 45

3s + 3r = 45

multiply to match coefficients of r:

15s-15r=135

15s+15r=225

30s = 360

s=12

r=3

check:

45mi/9mph = 5 hr

45mi/15mph = 3 hr

**Answer this Question**

**Related Questions**

Math - How do you set this up? Solve the system using substitution: A boat ...

word problem - A motor boat took 4 hours to make a downstream trip with a ...

math - The speed of a stream is 6 mph. If a boat travels 52 miles downstream in ...

Intermediate Algebra Word Problem - A river's current is 4mph. A boat travels 48...

algebra - A boat traveling on the Snake River travels 24 miles upstream in 3 ...

MATH - A boat on a river travels 16 miles downstream in only 2 hours. It takes ...

Physics - A boat sets off perpendicular to the bank, to cross a river width of ...

Math (urgent) hw due tommorow! - The speed of a stream is 3 km/h. A boat travels...

math - A boat travels 8km upstream and back in 2 hours. If the current flows at ...

Math - Boat travels 10 mi upstream and 10 mi downstream the stream is moving ...