Question

an airplane was flying at the height of 1500m. if it descends at a constant rate of 40m per minute, how long will it take to descend to a height of 300m?

Answer 1

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plane was flying at a height of 1800m 
rate was 60per min 
Now if we consider the height from down we have to descend 1800-300=1500m 
So,150060=25min 

so,it will take 25min for the airplane to be at a height of 300m 

Answer 2

Answer:

It will take 30 minutes to descend to a height of 300 meters

Step-by-step explanation:

An airplane was flying at the height of 1500 m

So, The height of flying airplane = 1500 m

Now, the airplane starts descending

Rate of descending of the airplane = 40 m per minute

We need to find the time when it descend to a height of 300 m

To reach 300 m, Distance which is needed to be descended = 1500 - 300

                                                                                                         = 1200 m

So, Time needed = 1200/40

                              = 30 minutes

Hence, It will take 30 minutes to descend to a height of 300 meters