Question

A commercial jet has been instructed to climb from its present altitude of 6000 feet to a cruising altitude of 30,000 feet. If the plane ascends at a rate of 4000 ​ft/min, how long will it take to reach its cruising​ altitude?

Answer 1

6 min

Explanation:

(a) Calculate the change in height

Δh = h₂ - h₁ = 30 000 ft - 6000 ft = 24 000 ft

(b) Calculate the time to reach altitude

distance = rate × time

Divide both sides by rate

time = distance/rate = 24 000 ft × (1 min/4000 ft) = 6 min

It takes 6 min to reach cruising altitude.