Answer
$43.2ps$
Work Step by Step
We know that
$t_3=(\frac{L}{c})(n_9+n_8+2n_7)$
We plug in the known values to obtain:
$t_3=(\frac{0.002}{3\times 10^8})\times(1.60+1.70+2\times 1.59)=43.2ps$
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