Task: Question Answering
Input (English): Problem: a car traveling at a certain constant speed takes 15 seconds longer to travel 1 kilometer than it would take to travel 1 kilometer at 60 kilometers per hour . at what speed , in kilometers per hour , is the car traveling ? 
Options: a ) 48 , b ) 50 , c ) 52 , d ) 54 , e ) 56
Output (English): a