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Paul can mow the grass in 50 minutes, while Dan takes 150 minutes (3 times 50 minutes). Their combined work rate is ( \frac{1}{50} + \frac{1}{150} = \frac{3 + 1}{150} = \frac{4}{150} = \frac{2}{75} ) of the lawn per minute. Therefore, together they can complete the job in ( \frac{75}{2} = 37.5 ) minutes.

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