Question

Three alarm clocks ring at intervals of 4,12 and 20 minutes respectively. If they start ringing together, after how much time will they next ring together.

Answer 1

Step-by-step explanation:

FACTORS OF 4=2,2

FACTORS OF 12=2,2,3

FACTORS OF 20=2,2 5

LCM= 2×2×3×5

LCM=60

after 6p min they will ring next

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Answer 2

Step-by-step explanation:

we shall take the LCM of following given number

so the LCM of 4,12,20 is =60

60 minutes =1hour

so the bell rings together after 1hour