Question

Can someone please help me how to set this up?

Answer 1

The car has a 12 mile head start, going 80 mph, so his distance is:dcar=80∗t+12
The is going at 108 mph, so his distance is:dcop=108t
Setting them equal to each other we get:80t+12=108t⇒12=28t⇒t=1228=37
So 3/7 of an hour.about 25.7 mins.

Answer 2

Answer:

The time is 0.428 hr.

Explanation:

Given that,

Final speed = 108 mph

Initial speed = 80 mph

Distance = 12 miles

We need to calculate the time

Using formula of time

$v = \dfrac{d}{t}$

d = distance

t = time

Put the value into the formula

$108-80=\dfrac{12}{t}$

$t = \dfrac{12}{108-80}$

$t =0.428\ hr$

Hence, The time is 0.428 hr.