本题目来源于试卷: Properties of Functions，类别为 IB数学
[问答题]
The ocean pressure, rpxa ,sahrb9r0,9ckog s, x9 ; P , under8 xlwm lv5)us, sea level can be modelled by the function
$P(D)=\frac{D}{10}+1$
where D is the distance in metres below sea level and P is measured in atmospheres.
A submarine cruising near the surface is submerged according to the function
D(t)=10+5 t
where t is measured in minutes and D is the distance the submarine is below sea level, measured in metres.
1. Find the composite function $P \circ D$ and explain what it means in the context of this question
2. Find and interpret $(P \circ D)(10)$ .
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