Task: Question Answering
Input (English): Problem: marla starts running around a circular track at the same time nick starts walking around the same circular track . marla completes 10 laps around the track per hour and nick completes 5 laps around the track per hour . how many minutes after marla and nick begin moving will marla have completed 4 more laps around the track than nick ? 
Options: a ) 5 , b ) 48 , c ) 12 , d ) 15 , e ) 20
Output (English): b