Will give brainliest
an air force plane left nairobi and flew west at an average speed of 159 mph. a cargo plane left sometime later flying in the same direction at an average speed of 207 mph. after flying for 5.3 hours the cargo plane caught up with the air force plane. find the number of hours the air force plane flew before the cargo plane caught up.
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The air force plane travelled for a total of 6.9 hours.

SOLUTION:

Given, An Air Force plane left Nairobi and flew west at an average speed of 159 mph.  A cargo plane left sometime later flying in the same direction at an average speed of 207 mph.  After flying for 5.3 hours the cargo plane caught up with the Air Force plane.  

We have to find the number of hours the Air Force plane flew before the cargo plane caught up.

Now, we know that,

For air force plane

Now, when cargo plane caught the air force plane the distance travelled by the planes will be equal.

So,

Time taken by air force plane = 6.9  hrs

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)

could you reply to this with the question so i can ?