Astronaut Spud Nick Is Space-Travelling from Planet X to Planet

Multiple Choice

Astronaut Spud Nick is space-travelling from planet X to planet Y at a speed of 0.60 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 the frame of the planets.What is the difference in time of arrival of the flashes from the explosions as observed by Spud?

A) 300 min
B) 150 min
C) 75 min
D) 0 min