two trucks leave at the same time, one going 60 mph and one going 30mph. how long until they are 150 miles apart?

Question

 two trucks leave at the same time, one going 60 mph and one going 30mph. how long until they are 150 miles apart?

Answer 1

This question can only be answered if the relative direction of the trucks is given.

 

If their paths are in opposite directions, then they separate at a rate of 90 mph. If their paths are perpendicular, for example, then their distances would be obtained by use of the Pythagorean theorem, for example.