Answer
a.$\boxed{80 \frac{2}{3}}$
b. $\boxed{193600}$
Work Step by Step
a. $15 mph = 22 ft/second$
$\frac{55}{15} \times 22 = \boxed{80 \frac{2}{3}}$
b. $60$ seconds are in a minute, and the car travels ${80 \frac{2}{3}}$ feet per second. 40 minutes is 2400 seconds. $2400 \times {80 \frac{2}{3}} = \boxed{193600}$