Answer
$42.0ps$
Work Step by Step
We know that:
$t_1=(\frac{L}{c})(n_1+n_2+n_4+n_5)$
We plug in the known values to obtain:
$t_1=(\frac{0.002}{3\times 10^8})\times(1.55+1.70+1.60+1.45)=42.0ps$
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