Task: Question Answering
Input (English): Problem: two clocks are set correctly at 1 0 ' clock in the afternoon. one keeps correct time. the other gains 5 seconds per minute. that evening, when the fast clock shows 6: 20, what does the correct clock show ?
Options: a. 4.0, b. 5.0, c. 6.0, d. 7.2, e. 3.5
Output (English): c