Task: Question Answering
Input (English): Problem: an aeroplane covers a certain distance of 420 kmph in 6 hours . to cover the same distance in 4 2 / 3 hours , it must travel at a speed of ? 
Options: a ) 450 km , b ) 480 km , c ) 500 km , d ) 540 km , e ) 590 km
Output (English): d