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

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)
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A ship is moving at a speed of 30 kmyh parallel to a straight  shoreline. The ship is 6 km from shore and it passes a lighthouse at noon.
(a) Express the distance s between the lighthouse and the
ship as a function of d, the distance the ship has traveled  since noon; that is, find f so that s − f(d).
(b) Express d as a function of t, the time elapsed since noon;  that is, find t so that d − t(t).
(c) Find f o g. What does this function represent?

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