# Thread: Very urgent! Last minute cramming!

1. ## Very urgent! Last minute cramming!

Thank you guys so much for all the help you have given me. I do have one more question before the test though (that's in 40min). I don't know how to do this problem.

A pilot flew a jet from Montreal to Los Angeles, a distance of 2500 mi. On the return trip the average speed was 20% faster than the outbound speed. The round-trip took 9h 10min. What was the speed from Montreal to Los Angeles?

Just need help understanding the modeling.

2. Originally Posted by Chinnie15
Thank you guys so much for all the help you have given me. I do have one more question before the test though (that's in 40min). I don't know how to do this problem.

A pilot flew a jet from Montreal to Los Angeles, a distance of 2500 mi. On the return trip the average speed was 20% faster than the outbound speed. The round-trip took 9h 10min. What was the speed from Montreal to Los Angeles?

Just need help understanding the modeling.
Probably too late for the test, but....

$d=rt$

$t=\frac{d}{r}$

Total time = 9 hrs and 10 minutes = $\frac{55}{6}$ hrs.

r = rate going

r + .20r = 1.2r = rate coming back

distance = 2500 miles at each rate

Add the two times to equal total time.

$\frac{2500}{r}+\frac{2500}{1.2r}=\frac{55}{6}$