Two sightseeing boats sail around paradise island. one, the barnacle, is a comfortable old tub that makes the trip around the island in 50 minutes. the other, the pegasus, is a new cruiser that makes the trip in just 30 minutes. each boat waits 10 minutes in port between trips. if both boats started their first trip at noon, when will they next start a trip together?

4

Step-by-step explanation:

The topic is very easy ,just try to imagine as if the equation is happening to you.

It is so sure that a stranger cannot just enter your house without any permission, if such happens then the stranger must be an intruder.

Think of the equation given to you as two set of people . people with d and people without d , so what you will do is to connect the same type of people together , that is let 8 move to go and meet 4 and let 4d move to meet 5d , which gives

-4 + 8 = 5d -4d

  4 = d