# Thread: [SOLVED] I can't get this one....

1. ## [SOLVED] I can't get this one....

i thought the answer to this question would be 700, but on the answer sheet it says 500. I don't get how it was done. Please help, thanks.

If two planes leave the same airport at 1:00 PM, how many miles apart will they be at 3:00 PM if one travels directly north at 150 mph and the other travels directly west at 200 mph?

2. In 2 hours, plane A travels 300 miles.

In 2 hours, plane B travels 400 miles

It is just a 3-4-5 triangle. Use Pythagoras.

3. 2 hours have past, so the planes move 300 miles and 400 miles perpindicular to eachother, so how far apart they are is a pythagorean theorem question

We have to find the hypotneuse of this triangle, so let d be how far apart they are

$\displaystyle d^2=300^2+400^2$

you will see d is 500

4. i'm still not seeing where 500 is the answer. 25000 divided by 50 would give me 500 but where is the 50 coming from?

5. never mind i got it. thanks

6. Originally Posted by cnotez
i'm still not seeing where 500 is the answer. 25000 divided by 50 would give me 500 but where is the 50 coming from?
50 is not part of the problem, and there is no division involved.

$\displaystyle d = \sqrt{300^2 + 400^2}$

calculate it.