How long will a plane have to fly continuously with 1100 miles per hour in order to cover the same distance as that from earth to the next star, proxima centauri?

Explanation :

It is given that,

Velocity of plane, v = 1100 mi/h

Proxima Centauri is a red dwarf star. Its distance from Earth to  Proxima Centauri is 4.243 light year.

Or we can say that the distance between Earth and  Proxima Centauri is,

We know that, time

or

t = 2.5 years ( approx )

Hence, this is the required solution.

a and c

c is 100% but i am confused in a

seeing the graph would