I'll let you reason it out.
Say the estimated speed is 100mph which is 1.67 miles per minute. This further breaks down to 146.96 feet per second. You are on a low posted speed city street...what would you reasonably expect of a vehicle in the distance?
Oh, but he was only doing 80 mph. Okay then, 117.30 fps.
OK, your the Officer working this accident. How do you know this motorcycle was actually doing 80 MPH? How do you even know if the driver of the car even looked in the direction of the motorcycle?
I'm sure the motorcycle was speeding but the driver of the car could have been on the cell phone with her head up her ass.
Yes, both drivers could be at fault!