Question

A light blinks after every 3 seconds, another light blinks after every 5 seconds and the third one blinks after every 16 seconds. How many times do they blink together in half an hour.
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Answer 1

Answer:

7 times

Step-by-step explanation:

we have to find l.c.m.

that is 240 sec = 4min

30min ÷ 4min = 7.5

they will blink together 7 times

Answer 2

Step-by-step explanation:

I think this is correct

hope it helps you