Question

Two boats leave a jetty at 09 00. The first one returns to the jetty every 20 minutes and the second one returns every 25 minutes. At what time will the two boats next be at the jetty at the same time?

Answer 1

10:40

Step-by-step explanation:

Here, we want to get the time at which both boats will be at the jetty at the same time

This is a question that deals with multiples

We need to get the lowest common multiple of the two times

What this mean is that we need the lowest common multiple of 25 and 20

The lowest common multiple of these numbers is 100

What this mean is that both boats will be back at the Jetty in 100 minutes

Since 60 minutes make one hour, the conversion to an hourly scale will be 1 hour and 40 minutes

Adding this to the 09:00 , we have it that the time at which they both will be at the Jetty is 10:40