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Question 3. Two neon lights are turned on at the same time. One blinks every 4 seconds and the other blinks every 6 seconds. Answer the following questions, give your answer only.
a) How long will it take them to blink simultaneously for the first time after they are turned on? (simultaneously: at the same time)
a = 6 s
Question 3. Two neon lights are turned on at the same time. One blinks every 4 seconds and the other blinks every 6 seconds. Answer the following questions, give your answer only.
b) How many times will they blink simultaneously in the first 70 seconds after they are turned on?
b) 11
![](https://rs.olm.vn/images/avt/0.png?1311)
bài làm
The number of seconds lost in his watch's content is 60 times 4 times 60= 14400 Seconds
`5` minutes `= 5 xx 60= 300` seconds
`5` minutes `27` seconds : 3= `300 + 27 : 3=309` seconds
5min = 5 x 60seconds = 300sec
We have:
300 : 3 = 100(sec)