Question

Two bells toll at an interval of 42 and 24 sec. After they start at the same time ,again how many sec. Will they ring together?

Answer 1

Answer:

168 seconds later

Step-by-step explanation:

first step,

we should find the l.c.m of the two given timings

that is, 168 secs

Answer 2

Concept:

Time interval is the time period between any two time instances. Time gives us the existence of an event in past or in future.

Given:

Two intervals $42sec,24sec$

Find:

The time after which it will ring together and whether they will ring together.

Solution:

According to the problem,

If we find the $L.C.M$ of $42,24$ we will get the time.

Using divison method,

$2|42,24$

$3|21,12$

$|7,4$

Then, $2*3*7*4=168$

Yes, they will ring together.

Hence, after they start $168sec$ they will ring together.