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In an accurate clock, in a period of 2 hours 20 minutes the minute hand will move over = ?

In an accurate clock, in a period of 2 hours 20 minutes the minute hand will move over = ? Correct Answer 840°

Angle traced by the minute hand in 2 hours 20 minutes,i.e.,
$$\eqalign{ & = 140{\text{ minutes}} \cr & = {\left( {\frac{{360}}{{60}} \times 140} \right)^ \circ } \cr & = {840^ \circ } \cr} $$

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