Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test Quantitative Aptitude Number System LCM and HCF
Four bells ring at intervals of 5, 10, 12 and 15 minutes respectively. If they start ringing together at 3 o'clock, after what interval of time will they ring together and how many times will they ring together in 18 hours?
1
1 hour, 18 times
2
3 hours, 6 times
3
30 minutes, 36 times
4
More than one of the above
5
None of the above