SOLUTION: I have been unable to come up with an equation to solve this problem. Could I get some help with figuring it out. I appreciate it. A father and son are digging a garden that is 7

Question 131398: I have been unable to come up with an equation to solve this problem. Could I get some help with figuring it out. I appreciate it. A father and son are digging a garden that is 7 feet long and 5 feet wide. The father, working alone takes 3 hrs. The son working alone takes 4 hrs. If they work together how long would it take?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
Let t be the time it takes them working together
Father does 1/3 of the job in 1 hr.
Son does 1/4 of the job in 1 hr.
Together they do 1/t of the job in 1 hr.
1/3 + 1/4 = 1/t
4t+3t=12 multiply each side by 12t to eliminate fractions.
7t=12
t=12/7 hrs or 1 hr 43 min (approx.)
.
Ed
RELATED QUESTIONS
(((A stamp collection consists of 3, 8 and 15 cent stamps. The number of 8 cent stamps... (answered by stanbon)

Hello, I am having a problem with figuring this problem. I have been trying to figure... (answered by bucky)

Is this problem possible to solve? I have tried applying the Pythagorean theorem,... (answered by mananth,ikleyn,greenestamps)

I have been trying to solve this problem but I cannot seem to get it. Could somone help... (answered by Fombitz)

I have the following problem: 3x5+4-2x2+6-4=15 I need to insert parentheses and... (answered by math_helper)

I have a worded problem that is giving me trouble and I would really appreciate if... (answered by ankor@dixie-net.com)

Multiply the following functions. {{{(2x^2 - x -3)/(3x^2 + 7x + 4) * (3x^2 - 11x -20) (answered by Earlsdon,bucky)

I have a word problem that am having trouble figuring out how to work it out to come up... (answered by solver91311)

Could I please get help with this problem. I have tried different ways to solve it and... (answered by rapaljer,Theo)