If H equals 50km/sec/mpc, then a galaxy with radial velocity of 2000 km/sec probably has a distance of:?

Question

100,000 mpc
1950 mpc
40 mpc
2050 mpc
0.025 mpc

Answer 1

H = 50 km/s per Mpc

For each Mega Parsec of distance (Mega = 1 million; parsec is a unit of distance worth 3.26 light-years), the recession speed is 50 km/s

A galaxy at 2 Mpc recedes at 100 km/s
A galaxy at 10 Mpc recedes at 500 km/s
...
A galaxy at XXX Mpc recedes at 2000 km/s