state gov MP Forest Guard and Jail Prahari Mock Test 2023 Quantitative Aptitude Number System LCM and HCF
These friends receive message on their mobile phones at an interval of 20 minutes, 30 minutes and 45 minutes respectively. They start receiving message together at a particular time. After how much time will they receive message again on their mobile phone altogether?
1
1.5 hours
2
2 hours
3
2.5 hours
4
3 hours