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

Ex Input:
Problem: a train running at the speed of 70 km / hr crosses a pole in 9 sec . what is the length of the train ?

Ex Output:
175 m


Ex Input:
Problem: a 270 metres long bullet train running at the speed of 120 kmph crosses another bullet train running in opposite direction at the speed of 80 kmph in 9 seconds . what is the length of the other bullet train ?

Ex Output:
230


Ex Input:
Problem: there are 5 fictions and 6 non - fictions . how many cases are there such that 2 fictions and 2 non - fictions are selected from them ?

Ex Output:

150