Quantitative Aptitude Ques 1605

Question: Six bells commence tolling together at intervals of 2, 4, 6, 8, 10 and 12 s, respectively. In 30 min how many times do they toll together?

Options:

A) 4

B) 10

C) 15

D) 16

Show Answer

Answer:

Correct Answer: D

Solution:

  • [d] LCM of 2, 4, 6, 8, 10, 12 = 120
    $ \therefore $ All six bells toll together at an interval of 120 s or 2 min. So, in 30 min they will toll together $ =\frac{30}{2}+1=16,time $ [including the one at beginning]
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