Three bells toll together at intervals of 9, 12 and 15 minutes. If they start toiling together, after what time will they toll next?
a. 1 hour
b. 2 1/2 hours
c. 3 hours
d. 3 1/2 hours
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Answer: c. 3 hours
Explanation:
To find in what time they ring together, we must find their LCM.
LCM of 9, 12, 15 = 180 = 180 / 60 = 3hrs.
The answer that we got is in minutes since we found the LCM of 3 given minutes.
Explanation:
To find in what time they ring together, we must find their LCM.
LCM of 9, 12, 15 = 180 = 180 / 60 = 3hrs.
The answer that we got is in minutes since we found the LCM of 3 given minutes.
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