Class 10 Exam  >  Class 10 Questions  >  Four different electronic devices make a beep... Start Learning for Free
Four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2) hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ________.
  • a)
    12 midnight
  • b)
    3 a.m.
  • c)
    6 a.m.
  • d)
    9 a.m.
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Four different electronic devices make a beep after every 30 minutes, ...
Solution:

Given, four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2) hour and 1 hour 45 minutes respectively.

Therefore, the time period of each device is given as follows:

- Device 1 beeps after every 30 minutes
- Device 2 beeps after every 1 hour
- Device 3 beeps after every 1(1/2) hour
- Device 4 beeps after every 1 hour 45 minutes

To find the time when all the four devices beep together, we need to find the LCM (Least Common Multiple) of the given time periods.

- LCM of 30 minutes, 1 hour, 1(1/2) hour, and 1 hour 45 minutes

Firstly, we convert all the given time periods into minutes.

- 30 minutes = 30 minutes
- 1 hour = 60 minutes
- 1(1/2) hour = 90 minutes
- 1 hour 45 minutes = 105 minutes

Now, we find the LCM of the above time periods.

- LCM of 30, 60, 90, 105 = 630 minutes

Therefore, all the four devices will beep together after every 630 minutes.

Given that the devices beeped together at 12 noon, we need to find the next time when they will beep together.

- 12 noon + 630 minutes = 9 a.m.

Hence, the correct answer is option D, i.e., 9 a.m.
Free Test
Community Answer
Four different electronic devices make a beep after every 30 minutes, ...
L.C.M. (30, 60, 90, 105) = 22 × 32 × 5 × 7 = 1260 mins = 21 hours.
Attention Class 10 Students!
To make sure you are not studying endlessly, EduRev has designed Class 10 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 10.
Explore Courses for Class 10 exam

Top Courses for Class 10

Four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2)hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ________.a)12 midnightb)3 a.m.c)6 a.m.d)9 a.m.Correct answer is option 'D'. Can you explain this answer?
Question Description
Four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2)hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ________.a)12 midnightb)3 a.m.c)6 a.m.d)9 a.m.Correct answer is option 'D'. Can you explain this answer? for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about Four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2)hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ________.a)12 midnightb)3 a.m.c)6 a.m.d)9 a.m.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2)hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ________.a)12 midnightb)3 a.m.c)6 a.m.d)9 a.m.Correct answer is option 'D'. Can you explain this answer?.
Solutions for Four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2)hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ________.a)12 midnightb)3 a.m.c)6 a.m.d)9 a.m.Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 10. Download more important topics, notes, lectures and mock test series for Class 10 Exam by signing up for free.
Here you can find the meaning of Four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2)hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ________.a)12 midnightb)3 a.m.c)6 a.m.d)9 a.m.Correct answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2)hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ________.a)12 midnightb)3 a.m.c)6 a.m.d)9 a.m.Correct answer is option 'D'. Can you explain this answer?, a detailed solution for Four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2)hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ________.a)12 midnightb)3 a.m.c)6 a.m.d)9 a.m.Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of Four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2)hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ________.a)12 midnightb)3 a.m.c)6 a.m.d)9 a.m.Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Four different electronic devices make a beep after every 30 minutes, 1 hour, 1(1/2)hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ________.a)12 midnightb)3 a.m.c)6 a.m.d)9 a.m.Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice Class 10 tests.
Explore Courses for Class 10 exam

Top Courses for Class 10

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev