Task: Question Answering
Input (English): Problem: an escalator moves towards the top level at the rate of 12 ft . sec and its length is 210 feet . if a person walks on the moving escalator at the rate of 2 feet per second towards the top level , how much time does he take to cover the entire length . 
Options: a ) 15 sec , b ) 10 sec , c ) 12 sec , d ) 8 sec , e ) 9 sec
Output (English): a