The distance is 19.65 (rounded).
The leg distances are 5 and 19, respectively, and the diagonal is the square root of the sum of the squares.
52 + 192 = 25 + 361 = 386, and sqrt 386 = 19.6468 about 19.65
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It works out as the square root of 386 which is about 19.647 rounded to 3 decimal places
-3
It is 31 units.
Provided the car is traveling at a constant rate of speed, it would seem to take 40 seconds to reach the last pole (2 sec per pole).However, this only applies if the car began traveling from some point at the same distance from the first pole. No starting point is given. Did the car start at pole one or did it start at a position before the first pole equal to the distance between the poles? If the car started at pole one, then it has only covered 11/19 of the distance from start to end, and will reach the 20th pole in 41.45 seconds.
The number halfway between 7 and 31 is 19.