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 r 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