math
posted by tammy .
13. 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?
A. 50 miles
B. 100 miles
C. 500 miles
D. 700 miles
E. 1,000 miles

One will travel 300 miles and other 400 miles.
Imagine these are two sides of a right angle triangle. Then use the Pythagorean theorem to find their distance apart. We'll be glad to check your answer.