Chapter 11 QuaDraTiC appliCaTionS 437
() 40 () 30 10
1600 900 100
2500 100
1
222
22
2
2
tt
tt
t
t
+=
+=
=
=^000
2500
100
2500
10
50
1
5
t
t
=
==
After^15 of an hour (or 12 minutes) the car and train will be 10 miles
apart.
PRACTICE
- A car and plane leave an airport at the same time. The car travels
eastward at an average speed of 45 mph. The plane travels south-
ward at an average speed 200 mph. When will they be 164 miles
apart? - Two joggers begin jogging from the same point. One jogs south at the
rate of 8 mph and the other jogs east at a rate of 6 mph. When will they
be 5 miles apart? - A cross-country bicyclist crosses a railroad track just after a train passed.
The train is traveling southward at an average speed of 60 mph. The
bicyclist is traveling westward at an average speed of 11 mph. When will
they be 244 miles apart? - A motor scooter and car left a parking lot at the same time. The motor
scooter traveled north at 24 mph. The car traveled west at 45 mph. How
long did it take for the scooter and car to be 34 miles apart? - Two cars pass each other at 4:00 at an overpass. One car is headed north
at an average speed of 60 mph and the other is headed east at an aver-
age speed of 50 mph. At what time will the cars be 104 miles apart? Give
your solution to the nearest minute.
PRACTICE
- A car and plane leave an airport at the same time. The car travels
eastward at an average speed of 45 mph. The plane travels south-
PRACTICE
- A car and plane leave an airport at the same time. The car travels