three bells ring at a time interval 20,40 and 60 minutes respectively.if they have rung together now,after how long will they next ring together?
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Answer:
10 hours
Step-by-step explanation:
To find the minimum time,we have to find the LCM of 25,40,60
⇒ 25=5^2
⇒ 40= 2^3 *5
⇒ 60 = 2^2 *3*5
Therefore,
LCM = 2^3 *3*5^2 = 8*3*25 = 600
SO, they meet after 600 minutes
That is 10 hours. (1 hr. - 60 min)
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