Answer
$T_b = 15.25~T_r$
Work Step by Step
As we calculated in part (c):
$T_b = 6.1~s$
We can find $T_b$ in terms of $T_r$:
$\frac{T_b}{T_r} = \frac{6100~ms}{400~ms}$
$\frac{T_b}{T_r} = 15.25$
$T_b = 15.25~T_r$
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