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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?

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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