Posted by **Kelsey** on Wednesday, May 14, 2008 at 2:00am.

I need help with this problem:

Two planes start from Los Angeles International Airport and fly in opposite directions. The second plane starts ½ hour after the first plane, but its speed is 80 kilometers per hour faster. Find the airspeed of each plane if 2 hours after the first plane departs the planes are 3200 kilometers apart.

- Math -
**bobpursley**, Wednesday, May 14, 2008 at 3:28am
distance slow plane=vt

distance fast plane=.5*(v+80)t +(v+80)t

3200=sum of the two distances, or

3200=v*2+.t(v+80)*2 + (v+80)*2

solve for v, then for the faster plane, its speed is v+80

- Math -
**bobpursley**, Wednesday, May 14, 2008 at 3:39am
40 times five is 200

## Answer this Question

## Related Questions

- Math - Two small planes start from the same point and fly in the opposite ...
- Math - A plane leaves Chicago headed for Los Angeles at 520 mph. One hour later...
- math - A plane leaves Chicago headed for Los Angeles at 520 mph. One hour later...
- math - A plane leaves Chicago headed for Los Angeles at 520 mph. One hour later...
- math - A plane leaves Chicago headed for Los Angeles at 520 mph. One hour later...
- Math - Two small planes start from the same point and fly in the same direction...
- Trig - Two planes take off at the same time from an airport. The first plane is ...
- Math - Plane A leaves the airport. One hour later, Plane B leaves the same ...
- math - Two planes took off from a Chicago airport flying in opposite directions...
- Math - The distance to fly direct from Detroit to Los Angeles is about 1,960 ...