Janet has 60 miles to travel and drives at 40 m/h. Bill has 80 miles to travel and also drives at 40 m/h. (a) How long does Janet's journey take? (b) How much longer does Bill spend driving than Janet?

Step 1 (a): Use the formula for time.
$t = \frac{d}{v}$
where $d$ is distance in miles and $v$ is speed in mph.

For Janet: $d = 60$ miles, $v = 40$ mph.
$t_J = \frac{60}{40} = 1.5 hours$

Janet's journey takes $\boxed{1.5 hours}$.

Step 2 (b): First find Bill's time.
For Bill: $d = 80$ miles, $v = 40$ mph.
$t_B = \frac{80}{40} = 2 hours$

Difference:
$t_B - t_J = 2 - 1.5 = 0.5 hours$

Bill spends $\boxed{0.5 hours}$ longer driving than Janet.