This is a thought experiment question on time dilation/ relativity etc.
'Jack McCormick' leaves the Earth at 99.99% the speed of light. Later, he looks at his wrist watch and his wrist watch tells him that 12 hours have passed since he left Earth. Jack turns around and comes back to Earth. According to his wrist watch, only 24 hours passed since he first left Earth. But, the people he knew are all dead because 180 years passed for the people on Earth, while only 24 hours passed for Jack.
For his next trip, Jack wants to leave Earth and return to Earth in such a way that his wrist watch tells him that 24 hours have passed for him, but only 1 hour passes for the people on Earth.
At what Velocity does Jack need to travel, for this to be possible?