Discussion
The afternoon classes in a school begin at 2:00 P.M. and end at 4:52 P.M. There are four afternoon class periods with 4 minutes between periods. The number of minutes in each class period is
Answer: B
Each class period is 40 minutes long.
From 2:00 P.M. to 4:52 P.M. is 172 minutes. Four periods in a row have only three breaks between them, using 12 minutes.
\[ \begin{aligned} 4p + 3 \times 4 &= 172 \\ 4p &= 160 \\ p &= 40 \end{aligned} \]
Counting four breaks instead of three gives (172 - 16) / 4 = 39, the trap answer. 36 and 45 do not fit the 172-minute block with three 4-minute breaks.
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