Given that the distance of Earth from Betelgeuse is
There are 3.1 x 10^7 s in a year.
(ii) Also, the speed is v = 25000 m/s
The time taken in seconds will be
The time taken in years will be
(iii) The distance between stars is very huge, so the time taken to travel that much distance is very large.
It might take a lifetime of humans with the current existing technology.
To increase the speed and decrease the time for traveling, a lot of fuel and energy will be required which is not possible with current resources and technology.
Thus, with our current technology, human travel between stars is not possible.