Question

Four bells ring simultaneously and afterwards at intervals of 3 4 5 and 6 seconds respectively . At what interval will they all ring together ?

Answer 1

Answer:

After 60 seconds (i.e after 1 minute.)

Step-by-step explanation:

Find the LCM of 3, 4, 5 and 6

$3 = 1 \times 3 \\ 4 = 2 \times 2 \\ 5 = 1 \times 5 \\ 6 = 2 \times 3 \\ hence \: \: l.c.m. = 2 \times 2 \times 3 \times 5 = 60$

Hence, bells will ring again after the interval of 60 seconds ( or 1 minute )