Task: Question Answering
Input (English): Problem: the first flight out of phoenix airport had a late departure . if the next 3 flights departed on - time , how many subsequent flights need to depart from phoenix on - time , for the airport ' s on - time departure rate to be higher than 60 % ? i will see what is the quickest way to solve it then i will provide the explanation 
Options: a ) 6 , b ) 7 , c ) 9 , d ) 4 , e ) 11
Output (English): d