Question
Look at your watch face. Through how many right angles does the minute hand moves between $8:00$ O’clock and $10:30$ O’clock?
✓
Answer
The time interval between $8:00$ O’clock and $10:30$ O’clock is $2.5$ hours, i.e., two and a half hours. In $1$ hour, the minute hand turns by a complete angle, i.e., $360^\circ $ or $\frac{360^\circ}{90^\circ}=4$ right angles. Thus, in $2.5$ hours, the minute hand will turn by $2.5 \times 4 = 10$ right angles.
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