The task is to generate the correct answer for a given math problem.

[Q]: Problem: a train running at the speed of 40 km / hr crosses a pole in 9 seconds . what is the length of the train ?
[A]: 100 meter


[Q]: Problem: the mean daily profit made by a shopkeeper in a month of 30 days was rs . 350 . if the mean profit for the first fifteen days was rs . 255 , then the mean profit for the last 15 days would be
[A]: rs . 445


[Q]: Problem: two - third of a positive number and 144 / 216 of its reciprocal are equal . the number is :
[A]: