Rohan blinks every 2 seconds while rahul blinks every 5 seconds. when will both of them blink at the same time?
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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 may times do they flash together in each hour?
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Asked on December 30, 2019 byTrisha Pavi
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 may times do they flash together in each hour?
A
30
B
24
C
20
D
60
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ANSWER
Red light blinks 3 times per minutes i.e.
after every 360 seconds =20 seconds
Green light blinks 5 times per 2 minutes
i.e. after every 5120 seconds =24 seconds
∴ Now they will blink after
L.C.M. of (20 and 24) seconds =120 sec −2 minutes
Hence, the number of times they blink in
1 hour =260=30.
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The above ans is copied .. bro
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