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In 1 hour, 

B + T can complete 1/5 of the plane

T + J can complete 1/6 of the plane

B + J can complete 1/3 of the plane

2B + 2T + 2J = 1/5 +1/6 + 1/3 = 21/30

B + T + J = 21/60 = 7/20

In 1 hour, B + T + J can complete 7/20 of the plane.

To complete 20/20 of the plane, they will take 20/7 = 2 6/7 hour

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