Security A rounds every 2 minutes and 20 seconds in the gate 1. Security B rounds every 1 minute and 40 seconds in the gate 2. If they conduct rounds at the same time. After how many minutes they will rounds together again?

Step-by-step explanation:

Given

Required

After how many minutes, will they round together

First, convert the given time to minutes

So, we have:

List out the multiples of the time of both security personnel take round.

In the above lists, the common time is:

This implies that they go on round after

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step-by-step explanation:

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.