state gov UP Police Assistant Operator (Radio Cadre) Mock Test Quantitative Aptitude Number System LCM and HCF
Five clocks ring simultaneously at 5 pm. They ring at regular intervals of 15 min, 30 min, 60 min, 45 min and 90 min respectively. The next time all five clocks ring together is.
1
8 pm
2
6 pm
3
9 pm
4
7 pm