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15 September, 05:19

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?

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  1. 15 September, 07:00
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    6 min

    Step-by-step 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.
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