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MachineA takes 15 mins and Machine B takes 30 min to do the same job how long do they take to do the job together????

 Apr 13, 2020
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1/30    +    1/15      =   1/x        x is the minutes required when both working together.

1/30     +   2/30     = 1/x

3/30                    = 1/x

x = 10 minutes

 Apr 13, 2020

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