533. The lock chamber is 600 feet X 110 feet. Your towboat is 150 feet X 35 feet. Which of these tows will require a double lockage?

4 standard barges abreast next to your boat's head and 3 jumbo abreast in the lead
6 jumbo (3 abreast and 2 long) with a standard on each side of your boat
9 jumbo barges
A set-over single

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