GRE Exam Numerical Ability Clocks and Calendars

There are how many hours between x minutes past 12 noon and 8:10 p.m. of the same day, where x < 60 ?

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8 hours.

Irrespective of the minutes, difference in hours of 12 noon and 8pm of the same day is 8 hours.
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GRE Other Question

A triangle has a perimeter 13. The two shorter sides have integer lengths equal to x and x + 1. Which of the following could be the length of the other side?
Select as many as are correct.

A. 4
B. 6
C. 8 If Tony goes y miles in x hours, how many miles does he go per minute, in terms of x and y?
A. 60x/y B. y/60x C. 60y/x D. x/60y E. 60xy