Help me with these algebra questions?

1. Fay can prepare surgical equipment in 3 hours. Another nurse, Carlo, can do it in 4 hours. How long will it take if they work together?

2. A mason can put up a tile wall in 6 days. A helper can do it alone in 8 days. How long will it take them if they work together?

3. Together, Stanley and Elsie can mow a lawn in 3 hours. It would take Elsie 5 hours to do it alone. How long would it take stanley?

Problem 1:

(1/3) + (1/4) = 1/T

where T is the time it will take for Fay and Carlo to prepare surgical equipment together.

Problem 2:

(1/6) + (1/8) = 1/T

where T = time it will take the mason and helper to put up a tile wall if they work together.

Problem 3:

(1/5) + (1/S) = 1/3

where S = time it will take to mow the lawn if Stanley would do it alone.

I trust that given the above equations, you can solve for the respective unknowns.

question one~
one hour
question two~
two days
question three~
two hours

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　　Nursing Assistant 　　Nurse Salary 　　Nurse Practitioner 　　Nursing Profession 　　Travel Nursing 　　Surgical Nursing 　　Radiology Nursing 　　Pediatric Nursing 　　Operating room Nursing 　　Oncology Nursing 　　Nurse anesthetist 　　Neonatal Nursing

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