Short transit 3 hours

Hi. I intend to use the visa transit visa to China to get to North Korea. I will arrive at 06.30 in the morning in Beijing and my flight to Pyongyang is at 11.00. Is there enough time to get clear of customs, get the bags and checking to the Pyongyang flight? Do i need to get the transit G for this? If yes do the formalities take long? Thanks!