Question

A red light flashes 3 times per minute and a green light flashes 5 times in 2 minutes at regular intervals. If both lights start flashing at the same time, how many times do they flash together in each hour?​

Answer 1

Answer:

If both lights start flashing at the same time, how many times do they flash together in each hour? Solution: We see that the red light flashes 6 times in 2 minutes whereas the green light flashes 5 times in 2 minutes. Therefore, every 2 minutes, they will flash at the same time.

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Answer 2

Answer:

60 times

Step-by-step explanation:

1hour=60mins

Red light flashes 5 times per minute

per hour red light flashes=5*60=300

therefore,

Red light flashes 300 times per hour

Blue light flashes 6 times in 2 minutes

1min blue light flashes=6/2=3

per hour blue light flashes=3*60=240

300=2*2*3*5*5

240=2*2*2*2*3*5

HCF=2*2*3*5

      =60