Question

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?

Answer 1

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