posted by Anonymous .
Aircraft are landing and taking off on parallel runways at a busy airport. On its approach, one aircraft descends from an altitude of 1200m to an altitude of 500m in 35s. During the same time, a departing aircraft climbs from an altitude of 200 m to an altitudes of 1250m.
A) Write a system of linear equations to model the altitudes of the aircraft
B)When are the aircraft at the same altitude? What is that altitude?
I really don't get how to to this, Please help:(