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Mathematics, 23.07.2021 17:10 synite

A mechanic take 70 minutes to repair car another mechanic can do the same job in 30 minutes how long in minutes will it take them working together to repair a car A. 20
B. 50
C. 40
D. 21 ​

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A mechanic take 70 minutes to repair car another mechanic can do the same job in 30 minutes how long...
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