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Work problems calculator

This calculators will solve three types of 'work' word problems. Also, it will provide a detailed explanation.

Two Workers Problem
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First worker can do the job in and the second worker takes . How long would it take the two workers together to finish the job?

"How many workers" problem
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If men can do a job in days, how many would it take to do the job in days?

The pipe problem
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A swimming pool has 2 inlet pipes. One fills the pool in hours, the other in hours. The outlet pipe empties the pool in hours. If the pool is at first empty and all three pipes are open, how many hours will it take to fill up the pool?

working...
examples
example 1:ex 1:
First worker can do the job in $\color{blue}{5 \, \text{days}}$ and the second worker takes $\color{blue}{4 \, \text{days}}$. How long would it take the two workers together to finish the job?
example 2:ex 2:
First worker can do the job in $\color{blue}{45 \, \text{minutes}}$ and the second worker takes $\color{blue}{2 \, \text{hours}}$. How long would it take the two workers together to finish the job?
example 3:ex 3:
If $\color{blue}{12}$ men can do a job in $\color{blue}{15}$ days, how many would it take to do the job in $\color{blue}{10}$ days?
example 4:ex 4:
A swimming pool has 2 inlet pipes. One fills the pool in $\color{blue}{14}$ hours, the other in $\color{blue}{20}$ hours. The outlet pipe empties the pool in $\color{blue}{10}$ hours. If the pool is at first empty and all three pipes are open, how many hours will it take to fill up the pool?

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