Detective A: (The Victim said) speeding through Times Square after six? (And She's lying.)
Detective B: You'd make better time on a goat.
I know 'goat time' means 'good time', but I don't know how I understand 'time on a goat'.
Maybe the victim is lying, so you'd better no waste your time on her? Or it just means that you can't drive fast through Times Square after six?
Please help me to understand it perfectly!