book Maths Puzzle Numerical Ability

What kind of prperty is 1x4=4?

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book Other Question

The product of two even positive consecutive integers is 24. Find Both numbers Jeff leaves his house on his bicycle at 8:30 A.M. and averages 5 miles per hour. His wife, Joan, leaves at 9:00 A.M. following the same path and averaging 8 miles per hour. At what time will Joan catch up with Jeff?