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Jane can complete a sales route​ by herself in 4 hours. Dave can do the same job in 7 hours. How long will it take them to do it working together?
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Jane can complete a sales route​ by herself in 4 hours. Dave can do the same job in 7 hours. How long will it take them to do it working together?

User Naeemgik
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1 Answer

6 votes
t/4+t/7=1
28(t/4+t/7)=1
7t+4t=28
11t=28
t=28/11
User Andrewmitchell
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