There are 20 poles with a constant distance between each pole. A car takes 21 second to reach the 12th pole. How much will it take to reach the last pole.  Choose one.
A) 36.4543 B) 36.2727 C) 31.45128 D) 36.41288 E) 31.41222

Rationale: "assuming the car starts at the first pole . to reach the 12 th pole , the car need to travel 11 poles ( the first pole does n ' t count , as the car is already there ) . 11 poles 21 seconds 1 pole ( 21 / 11 ) seconds to reach the last ( 20 th ) pole , the car needs to travel 19 poles . 19 pole 19 x ( 21 / 11 ) seconds = 36.2727 seconds answer : b"
Answer: B