At what time between 9 and 10 o'clock will the hands of a clock be together?(49 +1/11) min past 9(59 +1/11) min past 10(49 +1/11) min past 11(49 +2/11) min past 9
Question
At what time between 9 and 10 o'clock will the hands of a clock be together?(49 +1/11) min past 9(59 +1/11) min past 10(49 +1/11) min past 11(49 +2/11) min past 9
Solution 1
The hands of a clock are together at (49 + 1/11) minutes past 9.
Here's the step by step explanation:
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At 9 o'clock, the minute hand is at 12 and the hour hand is at 9.
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The minute hand moves 12 times faster than the hour hand.
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So, to find out when the hands will be together, we need to find out when the minute hand has caught up with the hour hand.
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The minute hand will have to make a little more than a full circle to catch up with the hour hand, because the hour hand will have moved a little past 9 by the time the minute hand has made a full circle.
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The minute hand moves 360 degrees in 60 minutes and the hour hand moves 30 degrees in 60 minutes.
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So, the minute hand gains (360 - 30) = 330 degrees in 60 minutes.
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To find out when the hands are together, we need to find out when the minute hand has gained 30 degrees on the hour hand (because at 9 o'clock, the hands are 30 degrees apart).
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The minute hand gains 330 degrees in 60 minutes, so it gains 30 degrees in (60/330)*30 = 5.45454545 minutes.
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So, the hands will be together at 9:00 plus about 5.45 minutes, which is (49 + 1/11) minutes past 9.
Solution 2
The hands of a clock are together at (49 + 1/11) minutes past 9.
Here's the step-by-step explanation:
- The minute hand moves 12 times as fast as the hour hand.
- At 9 o'clock, the minute hand is at 45 and the hour hand is at 9.
- The minute hand needs to catch up to the hour hand, which is 15 minute spaces ahead.
- Since the minute hand moves 12 times as fast, it will take (15/11) hours to catch up.
- Convert this to minutes by multiplying by 60, which gives (900/11) minutes or (81 + 9/11) minutes.
- Subtract the 30 minutes that have already passed in the hour, which gives (49 + 1/11) minutes past 9.
Solution 3
The hands of a clock are together at (49 + 1/11) minutes past 9.
Here's the step by step explanation:
-
At 9 o'clock, the minute hand is at 12 and the hour hand is at 9.
-
The minute hand moves 12 times faster than the hour hand.
-
So, to find out when the hands will be together, we need to find out when the minute hand has caught up with the hour hand.
-
The minute hand will have to make a little more than a full circle to catch up with the hour hand, because the hour hand will have moved a little past 9 by the time the minute hand has made a full circle.
-
The minute hand moves 360 degrees in 60 minutes and the hour hand moves 30 degrees in 60 minutes.
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So, the minute hand moves 330 degrees more than the hour hand in 60 minutes.
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To find out when the hands are together, we need to find out when the minute hand has moved 330 degrees more than the hour hand.
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This happens at (49 + 1/11) minutes past 9.
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So, the hands of a clock are together at (49 + 1/11) minutes past 9.
Solution 4
The hands of a clock are together at (49 + 1/11) minutes past 9.
Here's the step by step explanation:
- The minute hand moves 12 times as fast as the hour hand.
- In every hour, the minute and hour hand overlap once.
- At 9 o'clock, the minute hand is at 45 and the hour hand is at 9.
- The minute hand needs to move 180 degrees to overlap with the hour hand.
- Since the minute hand moves 12 times as fast as the hour hand, it will take (180/11) minutes for the minute hand to catch up with the hour hand.
- Therefore, the hands of a clock will be together at (49 + 1/11) minutes past 9.
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