Astronaut Mark Uri is space-traveling from planet X to planet Y at a speed of o.65e relative to the planets, which are at rest relative to each other. When he is precisely halfway between the U is spacetraeling from planet X to planet Y at planets, a distance of 1.0 light hour from each one as measured in the planet frame, nuclear planets, a distance of 1.0 light-hour from each one as measured in the planet frame, nuclear devices are detonated on both planets. The explosions are simultaneous in Mark's frame. What is the difference in the time of arrival of the flashes from the explosions as observed by Mark?
A. 90 min
B. 0 min O
C. 180 min
D. 360 min
E. 113 min