Because the efficiency of a is 25% higher than that of B, a finishes 10 minutes later than B and 20 minutes earlier than B How many minutes does it take for Party B to complete the task of machining parts?

Efficiency ratio 1 + 25%: 1 = 5:4
The time ratio is 4:5
B needs (10 + 20) / (5-4) X5 = 150 minutes

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