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

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

A 30

B 24

C 20

D 60

Solution

Correct Answer: Option A

for red light->flash/min=3 fro green light->flash/min=10