The expression for the distance going to the island is:
[tex]Distance=tx[/tex]
where t is the time taken by the boat to reach the island.
Let d denote the distance traveled to the island.
x denote the speed of the boat.
and let t denote the time taken by boat to reach the island.
Now, as we know that the distance is the product of the speed and Time.
i.e.
[tex]Distance=Speed\times Time[/tex]
i.e.
[tex]d=tx[/tex]
