A man drives for awhile at 45 mph. Realizing he is late, he increases his speed to 60 mph and completes his 405 mile trip in 8 hours. How long does he drive at 45 mph?

By definition, we have the following equation:

d = v * t

Where,

d = Distance

v = rate

t = time

The total distance traveled will be:

45t + 60 (8 - t) = 405

Solving for the time we have:

t = 5 s

Answer:

he drives at 45 mph for 5 s