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What will be the angle between the hands of clock at 7:10 ?
155°
170°
185°
165°
None of the above
155°
Use the formula Angle = |30H - 5.5M| where H is the hour and M is the minutes, as this covers all clock angle scenarios instantly.
Use the formula Angle = |30H - 5.5M| where H is the hour and M is the minutes, as this covers all clock angle scenarios instantly.
Identify Given Values
Here, H = 7 (hours) and M = 10 (minutes). The hour hand moves 30 degrees per hour, and the minute hand moves 6 degrees per minute.
Apply the Angle Formula
The formula for the angle between hands is |30H - 5.5M|. Substituting the values: |30 * 7 - 5.5 * 10| = |210 - 55| = 155 degrees.
B: 170 is incorrect as it results from miscalculating the hour hand position. C: 185 is mathematically incorrect. D: 165 is incorrect as it fails to account for the minute hand's influence on the hour hand position.
A is correct because applying the formula |30H - 5.5M| yields |307 - 5.510| = |210 - 55| = 155 degrees.
Always remember the minute hand travels 0.5 degrees per minute relative to the hour hand; using the constant 5.5 avoids complex relative motion calculations.