Task: Question Answering
Input (English): Problem: sam and nik start from a and b respectively at the same time and travel towards each other at constant speeds along the same route . sam meets nik at point c on the road which is 600 m away from starting point a and 400 m away from point b . the speed of sam is 50 m / m ( meter / minute ) . how much time did sam take to cover the distance between a and b ? 
Options: a ) 10 minutes , b ) 15 minutes , c ) 20 minutes , d ) 22 minutes , e ) 17 minutes
Output (English): c