Question

A truck enters a highway driving 60 mph. A car enters the highway at the same
place 9 minutes later and drives 69 mph in the same direction. From the time the
car enters the highway, how long will it take the car to pass the truck?

Answer 1

If the solution is at n hours, then 60n<69n-9/60.

Answer 2

solution in minutes

Answer 3

9n>9/60, and n>1/60, so after one minute.

Answer 4

Yes it does thanks!

Answer 5

hmm wait...

Answer 6

i forgot to convert...

Answer 7

yeah I just got a negative number

Answer 8

60mph = 1 mile per minute
69 mph = 1.15 mile per minute

so the distance the car would have traveled when it overtakes will be

d = 1.15t

the distance the truck would have traveled will be

d = 1(t+9)

so equate them

1.15t = t + 9

solve for t

Answer 9

t=60
that would mean 60 minutes right?

Answer 10

yeah

Answer 11

cool thanks!

Answer 12

welcome