Task: Question Answering
Input (English): Problem: tammy climbed a mountain in two days. she spent a total of 14 hours climbing the mountain. on the second day, she walked at an average speed that was half a kilometer per hour faster, but 2 hours less than what she walked on the first day. if the total distance she climbed during the two days is 52 kilometers, how many e kilometers per hour did tammy walk on the second day ?
Options: a. 3, b. 3.5, c. 4, d. 4.5, e. 6
Output (English): c