Solve Each Of The Following Variation Problems By Setting Up A Formula To Expres

Solve each of the following variation problems by setting up a formula to express the relationship, finding the constant, and then answering the question. 

The time required to do a job varies inversely as the number of people working. It takes 5hr for 7 bricklayers to build a park well. How long will it take 10 bricklayers to complete the job? 

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