Task: Question Answering
Input (English): Problem: an escalator moves towards the top level at the rate of 12 ft . sec and its length is 150 feet . if a person walks on the moving escalator at the rate of 3 feet per second towards the top level , how much time does he take to cover the entire length . 
Options: a ) 10 sec , b ) 20 sec , c ) 15 sec , d ) 16 sec , e ) 14 sec
Output (English): a