Nathaniel Okusanya, received a life sentence with a minimum term of 20 years.
Nelson Idiabeta, detained at her majesty's pleasure, received a minimum term 19 years
Passing sentence his honour Judge Marks QC told the two teenagers:
"You have shown not one iota of remorse, both of you seeking to brazen it out in front of a jury."
More top news
At 15 metres high, make a dramatic entrance at London's Hayward Gallery.
Jason Edwards was compared to a boxer - relentlessly cornering and punching his opponent on the ropes.
Police had issued an urgent appeal to trace Malakhi Chijiutomi-Ghosh, who needs medication three times a day.