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  • Question
  • At what point of time after 3 O' clock, hour hand and minute hand are at right angles for the first time?


  • Options
  • A. 9 O' Clock
  • B. 4 H 371/6 min
  • C. 3 H 308/11 min
  • D. 3 H 328/11 min

  • Correct Answer
  • 3 H 328/11 min 

    Explanation

    Clock will make right angle at (5n + 15) x 12/11 min past n.
    Given that, n = 3
    ? Clock will make right angle at ( 5 x 3 + 15 ) x 12/11 min past 3 . =30 x 12 / 11 min past 3.
    = 328/11 min
    So required time = 3 H 328/11 min


  • More questions

    • 1. 
      ? .04

    • Options
    • A. .02
    • B. .2
    • C. .002
    • D. None of these
    • Discuss
    • 2. 
      If 144 = 14.4 , then the value of x is:
      0.144 x

    • Options
    • A. 0.0144
    • B. 1.44
    • C. 14.4
    • D. 144
    • Discuss
    • 3. 
      Suresh was born on October 4, 1999. Shashikanth was born 6 days before Suresh. The Independence day of that year fell on Sunday. Which day was Shashikanth born?

    • Options
    • A. Tuesday
    • B. Wednesday
    • C. Monday
    • D. Sunday
    • Discuss
    • 4. 
      Find the compound ratio of 2 : 7, 5 : 3 and 4 : 7?

    • Options
    • A. 147 : 40
    • B. 40 : 147
    • C. 147 : 30
    • D. 30 : 147
    • Discuss
    • 5. 
      The volume of a cuboid is 1989 cm 3 , while its length and breadth are 17 cm and 13 cm, respectively, Find the height of the cuboid.?

    • Options
    • A. 9 cm
    • B. 4 cm
    • C. 14 cm
    • D. 7 cm
    • Discuss
    • 6. 
      If March 2, 1994 was on Wednesday, January 1994 25, was on:

    • Options
    • A. Wednesday
    • B. Thursday
    • C. Tuesday
    • D. Monday
    • Discuss
    • 7. 
      The watch which gains uniformly is 2 minutes. slow at noon on Sunday and is 4 minutes. 48 seconds. fast at 2 pm on the following Sunday. The watch was correct at:

    • Options
    • A. 2 pm on Tuesday
    • B. 12 noon on Monday
    • C. 1 : 30 pm on Tuesday
    • D. 12 : 45 pm on Monday
    • Discuss
    • 8. 
      The first republic day of India was celebrated on 26th January, 1950. it was?

    • Options
    • A. Monday
    • B. Tuesday
    • C. Tuesday
    • D. Friday
    • Discuss
    • 9. 
      The ratio between the speeds of two buses is 5 : 3. If the 1st bus runs 400 km in 8 h, then find the speed of the 2nd bus.?

    • Options
    • A. 30 km/h
    • B. 15 km/h
    • C. 27 km/h
    • D. 37 km/h
    • Discuss
    • 10. 
      A person riding a bike crosses a bridge with a speed of 54 km/h. What is the length of the bridge, if he takes 4 min to cross the bridge?

    • Options
    • A. 3600 m
    • B. 2800 m
    • C. 3500 m
    • D. 4500 m
    • Discuss


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