Answer
Removing the sail, and turning the fan to aim toward the back of the boat would be effective at propelling the boat.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 6 - Think and Discuss - Page 107-108: 96
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