If f(x)= (3+x)/(x-3) what is f(a+2)
A. (5+a)/(a-1)
B. 3+f(a+2)/f(a)-1
C. (3+a)/(a-3)+2

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.