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Answer:
Do the LCM of Numbers 12,3,8,10,4
Then U will get the first time when they Meet
Then Divide total time with that u will get...
Option D 4 Times is ur Answer......
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Answered by
2
Correct answer is option 'D'.
We need the next instances when the alarm rings.
That means the Least Common Multiple (LCM) of 3, 4, 8, 10, 12 3, 4 divide 12 so neglect them.
take LCM of 8, 10 and 12
∴ LCM = 4x2x5x3= 120 = They ring after 2 hours
After starting, they ring together ist time in 2 hours.
Then 2nd time in 2+2 = 4 hours.
Then 3rd time in 6 hours.
And 4th time in 8 hours.
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