一、Fill in the Blanks (Total 3 questions, 10 points each)
1. In a 1000-meter race, when A reaches the finish line, B is 50 meters from the finish line; when B reaches the finish line, C is 100 meters from the finish line. So when A reaches the finish line, C is $\qquad$ meters from the finish line.
1. 145
1.【Solution】When A runs 1000 meters, B runs 950 meters, and when B runs 1000 meters, C runs 900 meters. Therefore, when A runs 1000 meters, C runs $950 \times \frac{900}{1000}=855$ (meters), so C is 1000 $-855=145$ (meters) away from the finish line.