The distance between two piers is S miles. Two boats started moving simultaneously at speeds R1 and R2. How can you find the distance D between them if they moved for T hours towards each other from the two piers

Answer 1

their combined speed is R1+R2
Since distance = speed * time, we have

D(T) = S-T(R1+R2)

extra credit: what is the domain of the function D(T), assuming that time stops when they meet?

Answer 2

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