A Math · Secondary 4 · Hard · Connected rates of change
The pressure P pascals and the area A cm2 of a piston are related by PA=k, where k is constant. When P=80, A=5 and dtdP=3Pa s−1. Find dtdA at this instant.
−163cm2s−1
−805cm2s−1
163cm2s−1
−316cm2s−1
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