If it takes a hrs for x to repair 1 machine and b hrs for y to repair 1 machine then how many hrs will they take to repair 750 machines if they work together?

If it takes a hrs for x to repair 1 machine and b hrs for y to repa

1.	If it takes a hrs for x to repair 1 machine and b hrs for y to repair 1 machine then how many hrs will they take to repair 750 machines if they work together?
A.	750 × ab/(a+b)
B.	750 (a+b)/ab
C.	750 ab
D.	750/(a+b)
Answer» B. 750 (a+b)/ab

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If it takes a hrs for x to repair 1 machine and b hrs for y to repair 1 machine then how many hrs will they take to repair 750 machines if they work together?

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