Working out separation in mega parsec?

Question

constant speed is 1.5 x 10^4 km s^-1, by how many megaparsec would the separation between us and the galaxy change over 2.0 billion yearsz.

i know that

1 Mpc = 3.1 x 10 ^19 and

1 year = 3.2 x 10^7 seconds

dont know what to do????? helppppp plzzzzzz

Answer 1

Easy: Distance = speed x time

and you've stated the conversion factors you need.