Question

an airplane is preparing to land at an airport it is 48,000 ft above the ground and it is descending at the rate of 3,300 ft per minute at the same airport another airplane is taking off and will ascend at the rate of 2,700 ft per minute when will the two airplanes be the same altitude and what will that altitude be​

Answer 1

8 minutes

alt. = 21,600 ft

Explanation:

Isolate the variable.

48,000 - 3,300x = 2,700x

48,000 = 2,700x + 3,300x

48,000 = 6,000x

8 = x

8 minutes

Substitution.

48,000 - 3,300(8) = 2,700(8)

48,000 - 26,400 = 21,600

21,600 = 21,600

21,600 ft