Question

A bell rings every 15 second another bell rings every 30 seconds At 3:00 pm the two bells ring simultaneously .at which time will the bells ring again at the same time

Answer 1

3:00:30 (Hour : Minutes : second)

Explanation:

Given:

Starting time = 3:00 PM

1st bell ring = every 15 second

2nd bell ring = every 30 second

Find:

Both bell ring = ?

Computation:

By taking LCM of 15 second and 30 second,

we get exact time both bell rings together

LCM of 15 second and 30 second = 30 seconds

So, the bell will ring again after 30 seconds.

So, at 3:00:30 both bell ring again.