Answers

2015-09-18T17:57:39+05:30
LCM of 8, 20, 25, 40 is 200.
Therefore, they will ring together after an interval of 200 minutes.
∴ In 87 hours they will ring 87x60/200 = 26.1= 26 times and once at the start; so total = 26 + 1 = 27
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