Task: Question Answering
Input (English): Problem: a car traveling at a certain constant speed takes 2 seconds longer to travel 1 kilometer than it would take to travel 1 kilometer at 90 kilometers per hour . at what speed , in kilometers per hour , is the car traveling ? 
Options: a ) 71.5 , b ) 72 , c ) 72.5 , d ) 73 , e ) 85.7
Output (English): e