Task: Question Answering
Input (English): Problem: a car travels from point a to point b . the average speed of the car is 60 km / hr and it travels the first half of the trip at a speed of 48 km / hr . what is the speed of the car in the second half of the trip ? 
Options: a ) 72 , b ) 75 , c ) 80 , d ) 84 , e ) 90
Output (English): c