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A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and c in 198 seconds, all starting at the same point. After what time will they again at the starting point ?
  • a)
    26 minutes and 18 seconds
  • b)
    42 minutes and 36 seconds
  • c)
    45 minutes
  • d)
    46 minutes and 12 seconds
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A, B and C start at the same time in the same direction to run around ...
Required Time = LCM of 252, 308 and 198 seconds = 2772 seconds = 46 minutes 12 seconds.
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A, B and C start at the same time in the same direction to run around ...
Given:
- A completes a round in 252 seconds
- B completes a round in 308 seconds
- C completes a round in 198 seconds

To find:
- After what time will they again at the starting point?

Solution:
To find the time at which they will again meet at the starting point, we need to find the least common multiple (LCM) of the given times taken by A, B, and C to complete one round.

Step 1: Prime factorization of the given times:
- 252 = 2 * 2 * 3 * 3 * 7
- 308 = 2 * 2 * 7 * 11
- 198 = 2 * 3 * 3 * 11

Step 2: Finding the LCM:
The LCM is obtained by taking the highest powers of all prime factors involved.
- LCM = 2 * 2 * 3 * 3 * 7 * 11 = 2772 seconds

Step 3: Converting the LCM to minutes and seconds:
- 2772 seconds = 2772 / 60 minutes (quotient) + 2772 % 60 seconds (remainder)
- 2772 seconds = 46 minutes + 12 seconds

Therefore, they will meet again at the starting point after 46 minutes and 12 seconds. Hence, the correct answer is option D.
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A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and c in 198 seconds, all starting at the same point. After what time will they again at the starting point ?a)26 minutes and 18 secondsb)42 minutes and 36 secondsc)45 minutesd)46 minutes and 12 secondsCorrect answer is option 'D'. Can you explain this answer?
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