Plane A is at an altitude of 1991 feet and Plane B is just taking off. Plane A is gaining altitude at 35.5 feet per second and Plane B is gaining altitude at 80.75 feet per second.

Question

I just need to know the answer. Solving this is kind of difficult for me.

Answer 1

35.5t +1991= 80.75t

80.75t-35.5t =1991

45.25t=1991

t= 1991/45.25= 44 seconds

when both planes are at the same altitude = 3553 feet

check the answers

35.5(44)+1991

=1544+1991= 3553 ft for plane A in 44 seconds

80.75(44)= 3553 ft for plane B in 44 seconds