The answer depends on what kind of boat and how big.
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their are a total of 39 14 have no holes at all 25 have 4 holes, 18 of wich are red but only 13 of them have 4 holes so thiers 5 red without holes that leave the other 7 with 4 holes.
The answer will depend on how fast the boat can go as well as how many hours a day it is going.
The size of the holes in a sieve depends on what is the the size of material to be allowed through the holes. A set of sieves (flour sieves, garden riddles, etc) will range from large holes to fine.
4000
It is 1.08 km per minute.