Answers

2016-02-08T17:29:49+05:30
It matters from ship to ship like some contain 30 if its a short one and if its a big one then they will put some 300 or 310
it some times also depends on the material transported

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2016-02-08T17:30:13+05:30
I think it may on depend on the number of passengers in the ship
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