Aptitude Discussion

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

✔ A. |
30 |

✖ B. |
29 |

✖ C. |
31 |

✖ D. |
32 |

**Harshit Varshney**

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**Sm Mudabbir**

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red light will flash 6 times in 2 minutes and green flash 5 time in 2 min their lcm is 30 that is it

**Dan**

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Please correct the answer . It will be unitless as it is asked how many times lights will flash in 1 hour.

Thank you, Dan, for notifying, corrected it.

Red light - 3 times--1 min

6times --2min

green light- 5 times--2min

red light -150 times-- 60 min

green light -180 times-- 60 min

now take the HCF (150,180)=30