Task: Question Answering
Input (English): Problem: a car traveling at a certain constant speed takes 10 seconds longer to travel 1 kilometer than it would take to travel 1 kilometer at 40 kilometers per hour . at what speed , in kilometers per hour , is the car traveling ? 
Options: a ) 35 , b ) 35.5 , c ) 36 , d ) 36.5 , e ) 37
Output (English): c