state gov UP Police Assistant Operator (Radio Cadre) Mock Test Quantitative Aptitude Number System LCM and HCF
Six bells make a sound of tick together in the beginning and after every 5 sec, 10 sec, 15 sec, 20 sec, 18 sec, and 21 sec respectively. How many times will the bells ring together in 1.5 hours?
1
4
2
3
3
7
4
5