HCF & LCM · Question 19 · Easy
HCF & LCM question 19
Three traffic signals on a Bengaluru road change every 48 seconds, 72 seconds and 108 seconds respectively. If they all change together at 8:00:00 AM, when will they next change together?
- 8:07:12 AM
- 8:04:48 AM
- 8:03:36 AM
- 8:14:24 AM
Answer and explanation
Answer: A. 8:07:12 AM
Explanation: LCM of 48, 72 and 108 = 432 seconds = 7 minutes 12 seconds. So they next change together at 8:07:12 AM.
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