Answer
a) 375 $\frac{yard}{min}$
b) 5.72 $min$
Work Step by Step
a) The average velocity is defined as the change in displacement over the change in time:
$\bar{v} = \frac{\Delta d}{\Delta t}$
$\Delta d =$ 26 miles $+$ 385 yards = 46135 yards
$\Delta t =$ 2 hours $+$ 3 min = 123 min
$\bar{v} = \frac{\Delta d}{\Delta t} = \frac{46135}{123} =$ 375$\frac{yard}{min}$
b) $d =$ 25 miles = 44000 yards
$v = $ 375$\frac{yard}{min}$
$t = \frac{d}{v} =$ 117.8 min
The extra time is 123 - 117.26 = 5.72 minutes
