[填空题]
An astronaut on a spaceship traveling at 0+65ajv - *uxdl +5vbiddrck (d.75c r+ bss7d m0ts-relative to Earth measures his ship to be 25 m long. On the ship, he eats his lunch isr-0dsm t sb+7n 23 min.
(a) What length is the spaceship according to observers on Earth? L = m
(b) How long does the astronaut's lunch take to eat according to observers on Earth? $\Delta t$ = min
