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Qn #117
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Four bells ring simultaneously at starting and at an interval of 6 sec, 12 sec, 15 sec, and 20 sec respectively. How many times do they ring together in 2 hours?
A.
120
B.
60
C.
121
D.
112
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❓ Question: Four bells ring simultaneously at starting and at ... | TANCET Group Studies | Tancet Group Studies