exam Maths Puzzle Numerical Ability

First, i apologize for providing no ISBN. It's because I just got this clock problem from a quiz bowl which i witnessed in the past.

The problem is:

It is now between 9 and

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exam Other Question

One printer can print the paychecks for the employees of a company in 5 min. A second printer can print the checks in 81 min. How long would it take to print the checks with both printers operating? Solve for s

S=2n+2v