Question 127250
Janet can shovel snow from her driveway in 65 minutes. Bill can do the same job in 50 minutes. How long would it take if they worked together?
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Minutes, hours, days, years, it does not matter as long as you're consistent.
Don't use minutes for one person and hours for another, for example
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Let t = time to complete the job working together
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Let competed job = 1
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{{{t/65}}} + {{{t/50}}} = 1 
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Multiply equation by a multiple of 65 and 50;  650 come to mind
650*{{{t/65}}} + 650*{{{t/50}}} = 650(1)
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Cancel out the denominators and you have:
10t + 13t = 650
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23t = 650
t = {{{650/23}}}
t = 28.26 minutes
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Check solution using a calc
{{{28.26/65}}} + {{{28.26/50}}} = .9999 ~ 1