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Gala2k [10]
3 years ago
12

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?
Mathematics
1 answer:
Nataliya [291]3 years ago
4 0
T/4+t/7=1
28(t/4+t/7)=1
7t+4t=28
11t=28
t=28/11
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