railway RPF Constable Mock Test Series 2024 Quantitative Aptitude Number System LCM and HCF

Three runners are running in a circular track, and they complete one round in 20, 30 and 35 minutes respectively. When will they next meet at the starting point ?

1
After 3 hour 30 minutes
2
After 4 hour 30 minutes
3
After 3 hours
4
After 7 hours
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