Well, first of all, if there are astronauts aboard that ship, I hope they don't try to climb out yet. If they pointed straight at the moon and covered 216,000 km so far, they still have another 168,000 km to go before they get there.
Average Speed = (distance) / (time)
Speed = (216,000 km) / (72 hours)
Average Speed = 3,000 km/hr
also
Speed = (216,000 km) x (1000m/km) / (72 hr x 3600sec/hr)
Average Speed = 833.33 m/s
There's not enough information given to find the ship's velocity.