The task is to generate the correct answer for a given math problem.
--------
Question: Problem: a train covers a distance of 12 km in 10 minutes . if it takes 8 seconds to pass a telegraph post , then the length of the train is

Answer: 160 m


Question: Problem: what is the greatest prime factor of 2 ^ 10 - 1 ?

Answer: 3


Question: Problem: how many seconds will a train 140 meters long take to cross a bridge 150 meters long if the speed of the train is 36 kmph ?

Answer:
29 sec