Answer
C
Work Step by Step
$112~chirps/60~s=(112~chirps/60~s)(\frac{60~s}{60~s})(\frac{13~s}{13~s})=(112~chirps/13~s)(\frac{13~s}{60~s})=24.3~chirps/13~s$
$N=24.3=T-40.0$
$T=24.3+40.0$
$T=64.3$
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