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Question

A fence is constructed using 900 wooden planks. ‘X’ alone can place 10 planks per minute, while ‘Y’ alone can complete the fence in 100 minutes. ‘Z’, a curious kid, removes 4 planks per minute. If all three work together, how long will it take to finish the fence?

A 1 hrs

B 2 hrs

C 5 hrs

D 8 hrs

E None of these

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