Task: Question Answering
Input (English): Problem: a and b go around a circular track of length 600 m on a cycle at speeds of 30 kmph and 54 kmph . after how much time will they meet for the first time at the starting point ? 
Options: a ) 120 sec , b ) 360 sec , c ) 178 sec , d ) 187 sec , e ) 189 sec
Output (English): b