Posted by Jenn on Monday, May 14, 2012 at 5:19pm.
dan's rate -- swing/x , where x is the numbers of hours to assemble the swing by himself
kim's rate --- swing/(x+4)
so swing/x + swing/(x+4) = swing/1.5
divide by "swing"
1/x + 1/(x+4) = 1/1.5
x+4 + x= (x)(x+4)/1.5
both sides times 3
6x+12 = 2x(x+4)
2x^2 + 2x - 12 = 0
x^2 + x - 6 = 0
(x-2)(x+3) = 0
x = 2 or a negative, which would be silly
Dal would need 2 hours to do the job himself
Related Questions
intermediate algebra - Dal and Kim can assemble a swing set in 1/1/2 hrs,working...
Intermediate Algebra - Dale and Kim can assemble a swing set in 1 1/2 hours....
Math - Bryan and Kim are painting a house. Working together they can paint a ...
College Algebra - It takes Todd 3 hours longer than Tom to paint a 4x5 feet ...
algebra - Kim can mow the greens at golf course twice as fast as I can. Working ...
algebra - Kim can mow the greens at golf course twice as fast as I can. Working ...
Math word problem 2 - Sabine and Hercule can assemble a table in 45 minutes. ...
Math - Al can paint a room in a hours working alone. Bill can paint a room in b ...
finite math - A company installs different POS computer systems. POS system A ...
statistics - Kim and Susan are playing a tennis match where the winner must win ...
For Further Reading
