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Based on the time it takes Leo when he uses two machines, the length of time it will take if the large copier is broken is 75 minutes.
This can be found by the formula:
= 1 / ( (1 / time taken with both copiers) - (1 / time taken with large copier) )
Solving gives:
= 1 / ( ( 1 / 30) - (1 / 50))
= 1 / (1 / 75)
= 75 minutes
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