As astronaut on a spaceship traveling at 0.75c relative to earth measure his ship to be 25m

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As astronaut on a spaceship traveling at 0.75c relative to earth measure his ship to be 25m long on the ship, he eats his lunch in 24 min.
(a) What length is the spaceship according to observers on earth?
(b) How long does the astronaut’s lunch take to eat according to observers on earth?
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