Two stunt men are going to jump out of a stationary balloon 457 meters off the ground, jumper A will jump first, pulling his parachute at 4 seconds after the jump. Jumper B will jump precisely 20 seconds after jumper A. Jumper B is slightly heavier than jumper A, when their chutes are open, jumper A falls at 3.0 m/s while jumper B falls at 3.2m/s. After how many seconds will jumper B requires to pull his parachute after leaving the balloon to land at precisely the same time as jumper A on the ground? How long does the entire stunt take from the instant jumper A leaves the balloon?