जॉइन Examsbook
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प्र: Find at what time between 9 and 10 o’clock will the hands of a clock be in 180° ?

  • 1
    180/14 min past 10
  • 2
    180/11 min past 9
  • 3
    148/7 min past 10
  • 4
    154/11 min past 9
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उत्तर : 2. "180/11 min past 9"
व्याख्या :

Answer: B) 180/11 min past 9 Explanation: At 9 o’clock, the hour hand is at 9 and the minutes hand is at 12, i.e., the two hands are 15 min. spaces apart.So, the minute hand should gain = (30 - 15) minutes = 15 minutes55 minutes will be gained in 60 min.15 minutes spaces will be gained in ((60/55) x 15) min. = 180/11 min.The hands will be in the same straight line but not together i.e.,in 180 degrees at 180/11 min. past 9.

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