Task: Question Answering
Input (English): Problem: a person started from point a to point b and returned back to a with a speed of 60 kmh . if the distance between a and b is 120 km , calculate the time he travelled 
Options: a ) 4 hours , b ) 2 hours , c ) 3 hours , d ) 6 hours , e ) 5 hours
Output (English): a