Ab airplane takes off 12.5 miles south of a city and flies due north at a constant speed of 170 miles per hour. what is the planes position relative to the city after 45 minutes?

So so 170 miles per hour

we find several thing:
distance covered in 45 minutes
distance from other city

1 hour=60 minutes
45/60=3/4
it flew 3/4 hour
so multiply 170 by 3/4 to get 510/4=127 and 1/2 miles north
so it flew past the city since it 127 and 1/2>12.5
remember that 1/2=0.5
120 and 1/2=127.5
since it went past the city, the 127.5 includes the 12.5 miles from city to city and the other distance past it so we subtract 12.5 from 127.5 to find the distance that th plane went from the other city

127.5-12.5=115
the answer is 115 miles north of the city