Question
Three bells ring at regular intervals of 28 seconds, 60
seconds, and 84 seconds, respectively. Over a span of 10 minutes, how many times will all three bells ring simultaneously?Solution
Time taken by all 3 bells to ring together = L.C.M of 28, 60 and 84 = 420 seconds 10 minutes = 10 X 60 = 600 seconds 600 ÷ 420 ~ 1.42 So, the three bells will ring together only once in the given interval of 10 minutes.
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Select the figure from among the given options that can replace the question mark (?) in the following series.
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