exam Maths Puzzle Numerical Ability

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?

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exam Other Question

The Chunnel connects the United Kingdom and France by a railway tunnel under the English Channel. The British started tunneling 2.5 months before the French and averaged 0.63 kilo A low calorie dounut has 90% fewer caloires than a regular donut. How many low calorie would you need to eat to take in as many calories as you would get from a regular donut?