Task: Question Answering
Input (English): Problem: an aeroplane covers a certain distance at a speed of 320 kmph in 4 hours . to cover the same distance in 1 2 / 3 hours , it must travel at a speed of : 
Options: a ) 520 , b ) 620 , c ) 820 , d ) 768 , e ) 720
Output (English): d