Task: Question Answering
Input (English): Problem: it costs $ 2 for the first 15 minutes to use the bumper cars at a fair ground . after the first 15 minutes it costs $ 6 per hour . if a certain customer uses the bumper cars for 3 hours and 25 minutes , how much will it cost him ? 
Options: a ) $ 22 , b ) $ 3 , c ) $ 15 , d ) $ 21 , e ) $ 30
Output (English): d