other govt exam NWDA LDC Mock Test 2021 Quantitative Aptitude Number System LCM and HCF

Four bulbs light up at the interval of 2, 3, 4 and 5 minutes respectively at some moment. They are lit up together at 8:00 pm. At what time will all bulbs light up together? 

1
Night 8:45 
2
Night 9:45
3
Night 8:30 
4
Night 9:00 
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