SOLUTION: tom can point a fence in 2 hours and alice can point the same fence in 4 hours. how long would it take to point the fence if tom and alice point together?

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Question 674775: tom can point a fence in 2 hours and alice can point the same fence in 4 hours. how long would it take to point the fence if tom and alice point together?
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
1/2+1/4=1/X
2/4+1/4=1/X
3/4=1/X CROSS MULTIPLY.
3X=4
X=4/3
X=1 1/3 HOURS ANS.
PROOF:
1/2+1/4=1/(1 1/3)
3/4=.75
.75=.75