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° or $\frac{360^\circ}{90^\circ}=4$ right angles.
Thus, in 2.5 hours, the minute hand will turn by 2.5 × 4 = 10 right angles.

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