43. Argh, so many wrong responses. NO, it does NOT take 20 minutes.
The speed of light is invariant, regardless of the direction you're going in. But if you are moving away from the light source, as you specify, then of course the light will take longer to reach you. To believe it takes the same length of time exhibits a complete misunderstanding of relativity. It's basically Zeno's paradox of Achilles and the tortoise. Now when an observer at the departure point of the ship sees the light catch up with the ship is another matter entirely.
It will take 40 minutes for the light to reach the fleeing spaceship.
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