A ship is moving at a speed of 30 km/h parallel to a straight shoreline. The ship is 6 km from shore and it passes a lighthouse at noon.
(a) Express the distance
between the lighthouse and the ship as a function of
, the distance the ship has traveled since noon; that is, find
so that
.
(b) Express
as a function of
, the time elapsed since noon; that is, find
so that
.
(c) Find
. What does this function represent?
