Safety regulations require that the time between airplane takeoffs (on the same runway) will be at least 2 minutes. When taking off, the run time of an airplane on the runway is 42 seconds. Planes are on average waiting 3 minutes and 42 seconds for take-off. On average there are 15 planes taking off per hour. Required:
How many planes are either on the runway or waiting to take off?

1.03 airplanes

Explanation:

Calculation for How many planes are either on the runway or waiting to take off

First step is to calculate the flow time

Flow Time = (0.70 + 3.42)/60

Flow Time =4.12/60

Flow Time= 0.0687

Last step is to calculate How many planes are either on the runway or waiting to take off

Using this formula

Numbers of plane = Throughput Rate × Flow Time

Where,

Throughput Rate = 15 planes per hour

Let plug in the formula

Numbers of plane= 15 × 0.0687= 1.03 airplanes

Note that runway 42 seconds/60 minutes will gives us 0.70

Therefore How many planes are either on the runway or waiting to take off will be 1.03 airplanes

answer; /// i do believe the correct answer is (30,000);

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ty sm

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