[填空题]
Rocket A passes Eartojcf 5 8p5 bs 1i7b12eps-edrih at a speed of 0.75c. At the same time, rocket B pawt*)dww- cma7,jy1rm+b a 2hx sses Earth moving 0.95c relative to Earth in the same direction. How fast is B moving relativebwhcdawx-m artj2m)7 1y*w,+ to A when it passes A? u' = c
