Answer:
The expression for the distance going to the island is:

where t is the time taken by the boat to reach the island.
Explanation:
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.

i.e.
