Two trains leave the same point and travel along straight tracks that differ in direction by 65 degrees. If their speeds are 100mph and 80mph respectively, approximate how far apart they will be after 30 minutes.

I think I’m supposed to use law of cosines but I don’t know where the 30 goes in anywhere.

I have the problem like this so far:

Question

Two trains leave the same point and travel along straight tracks that differ in direction by 65 degrees. If their speeds are 100mph and 80mph respectively, approximate how far apart they will be after 30 minutes. 

I think I’m supposed to use law of cosines but I don’t know where the 30 goes in anywhere. 

I have the problem like this so far:

alexwee123 · Answer

you could also use vectors to solve this :D

pfenn1 · Answer

|dw:1337216442014:dw|You need the 30 minutes so you can figure how far the trains have traveled.