Task: Question Answering
Input (English): Problem: two men started from the same place walk at the rate of 10 kmph and 12 kmph respectively . what time will they take to be 40 km apart , if they walk in the same direction ? 
Options: a ) 5 hours , b ) 40 hours , c ) 8 hours , d ) 20 hours , e ) 30 hours
Output (English): d