There are three street lights which get on for one second after 30 s, 40 s and 50 s, respectively. If last time they were on simultaneously at 04:00 PM. At what time after 04:00 PM all of them get on again simultaneously?

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There are three street lights which get on for one second after 30 s, 40 s and 50 s, respectively. If last time they were on simultaneously at 04:00 PM. At what time after 04:00 PM all of them get on again simultaneously?

A04:10 PM

B04:11 PM

C04:12 PM

D04:14 PM

Answer:

A. 04:10 PM

Read Explanation:

LCM of 30, 40 and 50 = 600 s The street light get simultaneously on after 600 s i.e. 600/60 = 10 min

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