Task: Question Answering
Input (English): Problem: calculate how much time could be saved if the train would run at its usual speed , given that it ran at 4 / 9 of its own speed and got to its destination in 13 hours ? 
Options: a ) 1.22 hrs , b ) 2.22 hrs , c ) 5.22 hrs , d ) 6.22 hrs , e ) 7.22 hrs
Output (English): e