Task: Question Answering
Input (English): An airplane takes off from Boston for the 980 km trip to Detroit. The plane lands two hours later. Which of the following best describes the average speed and direction of the airplane's flight?  
 (A) 325 km/h W (B) 490 km/h W (C) 980 km/h W (D) 1960 km/h W
Output (English): B