Question

in a shop ,there are three clocks which chime at intervals of 15,20 and 30 minutes respectively. they all chime together at 10:00 a.m. at what time will they all chime together again.

Answer 1

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LCM of 15,20,30=60

so that clocks will chime together after every 60 minutes.

Therefore, after 10 am they will chime together at 11 am

$\mathcal \colorbox{yellow} {Answer by :- BrainlyBeyonder}$

Answer 2

Answer:

Given:

Three clocks chime at intervals of 15, 20 and 30 minutes

They all chime together at 10 a.m

Concept:

By taking LCM of 15, 20, 30 we get at what time all will chime again

Calculation:

LCM (15, 20, 30) = 60

∴ After 60 minutes or 1 hour, they all chime together again

⇒ They all chime together again at 11 am