Discussion
The Earth completes one full rotation on its axis in 24 hours. How many degrees does it rotate in 4 hours and 12 minutes ?
Answer: B
The Earth rotates through 63°.
A full turn of 360° in 24 hours is 15° an hour, or 1° every 4 minutes. 4 hours 12 minutes is 4.2 hours:
\[ \begin{aligned} 4 \times 15^{\circ} &= 60^{\circ} \\ 12 \text{ min} \div 4 &= 3^{\circ} \\ \text{Total} &= 63^{\circ} \end{aligned} \]
60° ignores the 12 minutes, and 64° and 65° overcount them.
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