Task: Question Answering
Input (English): Problem: a thief goes away with a santro car at a speed of 40 kmph . the theft has been discovered after half an hour and the owner sets off in a bike at 50 kmph when will the owner over take the thief from the start ? 
Options: a ) 22 hours , b ) 21 hours , c ) 23 hours , d ) 20 hours , e ) 28 hours
Output (English): d