One atta Time

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Compare the approximate speed per hour of Boat A to Boat B.

12+21+30+41+66 = 170 total knots
1+2+3+4+7 = 17 total hours
170÷17 = 10.0

4+15+59+68+78 = 224 total knots
1+2+7+8+9 = 27 total hours
224÷27 = 8.3

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