Astronomy exercise question

Question

A galaxy is observed to have a red shift which indicates a recession speed of 150 km/s. Use 75 km/s/Mpc for Hubble's constant and determine the distance to the galaxy in Mpc.

Answer:

a. 150

b. 11,250

c. 2 d. 0.5

d. none of these

Answer 1

v=(Hsub 0)(distance)

150/75= d

2=d in Mpc

answer is c