Question: There are 20 poles with a constant distance between each pole. A car takes 24 second to reach the 12th pole. How much will it take to reach the last pole.
Answer:
The car will take 41.45 seconds to reach the last pole.
Let the distance between two poles is X.
The car takes 24 seconds to reach the 12th pole. It means it travels distance of 11X in 24 seconds.
To reach the 20th pole car has to travel 19X. So time taken to reach there is
= (19X * 24) / 11X
= (19 * 24) / 11
= 41.45 seconds