In an accurate clock, in a period of 2 h 20 min. the minute

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In an accurate clock, in a period of 2 h 20 min. the minute hand will move over ?

1. 520°
2. 320°
3. 840°
4. 140°

Correct Option: C

2 h 20 min = 140 min
In every hour the minute hand move over 360°.
So, in every minute it will move 360°/60° = 6°
So, in 140 min the minute hand will move over = 6 x 140° = 840°