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John can paint a house in $3$ hours and Jane can paint a house in $4$ hours.

How long will it take the two of them working together to paint $1$ house?

A

$2$ hours

B

$\cfrac{10}{7}$ hours

C

$\cfrac{11}{7}$ hours

D

$\cfrac{12}{7}$ hours

E

$2 \cfrac{1}{2}$ hours

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