Imagine that George is 100 feet from a red firecracker and 40 feet from a blue firecracker. He is not moving relative to either. Both explode and he sees the flash of the red firecracker 60 nanoseconds after he sees the flash of the blue firecracker. According to George, which firecracker exploded first? (Use the approximation that the speed of light is 1 foot/nanosecond.)

Imagine that George is 10 feet from a red firecracker and 50 feet from a blue firecracker. He is not moving relative to either. Gracie, who is stationary with respect to George, is 30 feet from the red firecracker and 30 feet from the blue firecracker. Both firecrackers explode. George sees the flash from the blue firecracker 40 nanoseconds after the flash from the red. Gracie sees them flash at the same moment. According to George, which firecracker exploded first? According to Gracie, which firecracker exploded first?