Astronaut Spud Nick is space-traveling from planet X to planet Y at a speed of 0

Question

Astronaut Spud Nick is space-traveling from planet X to planet Y at a speed of 0.60c relative to the planets, which are at rest relative to each other. When he is precisely halfway between the planets, a distance of 1.0 light-hour from each one as measured in the planet frame, nuclear devices are detonated on each planet. The explosions are simultaneous in the frame of the planets. What is the difference in the time of arrival of the flashes from the explosions as observed by Spud? 113 min 0 min 75 min 300 min 150 min

Explanation / Answer

Time of 2nd planet to be seen is = distance / ( relative velocity)

= .5 light hour / .4 c = 75 mins

Difference in the time is 2 x75 = 150 as it is saving time on other planet

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