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Three printing presses, R, S, and T, working together at their respective constant rates, can do a certain printing job in 4 hours. S and T, working together at their respective constant rates, can do the same job in 5 hours. How many hours would it take R, working alone at its constant rate, to do the same job?

 Feb 16, 2021
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Hi Guest!

 

In one hour, R, S, and T can do 1/4 of the job. 

In one hour, S and T can do 1/5 of the job. 

So R in one hour can do 1/20 of the job (1/4 - 1/5)

So if in one hour, R can do 1/20, then she needs 20 hours to do the whole job. 

 

I hope this helped. :)))

 

=^._.^=

 Feb 16, 2021

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