Astronaut Mark Uri is space-travelling from planet X to planet Y at a speed of 0

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Astronaut Mark Uri is space-travelling from planet X to planet Y at a speed of 0

Astronaut Mark Uri is space-travelling from planet X to planet Y at a speed of 0.49 c. When he is precisely halfway between the planets, a distance of 1 light-hour from each, nuclear devices are detonated. The explosions are simultaneous in Mark's frame. What is the difference in time of arrival of the flashes from the explosions as observed by Mark?
A) 0 min
B) 100 min
C) 52 min
D) 210 min

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