plane going 150mph spots a car going 90 mph 10 miles ahead how long will it take the plane to reach the car?

Answer 1

If the car is going in the same direction then the car goes 90 t while the plane goes 150 t.
We know 150 t = 90 t + 10
so
60 t = 10
t = 1/6 hour or 10 minutes

Answer 2

If they are heading for each other then
150 t + 90 t = 10
If they are at some other angle it becomes a trig problem:)