exam Maths Puzzle Numerical Ability

One printer can print the paychecks for the employees of a company in 54 min. A second printer can print the checks in 81 min. How long would it take to print the checks with both printers operating?

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24. Welding: The parts bin which is 1 ft. by 2 1/2 ft. and 6 in made of 16 guage sheet metal. Calculate the volume in cubic feet and the total length of weld needed in feet. Rectangular stage. One side of a rectangular stage is 2 meters longer than the other. If the diagonal is 10 meters , then what are the lengths of the sides?