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Let's test your logic skills Captain! Johnny can row at 5 kmph in still water. If the velocity of the current is 1 kmph and it takes him 1 hour to row to the supply ship and come back, how far is the supply ship?

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Interesting fact:

The most important warship developed between the two world wars was the aircraft carrier. In World War II the aircraft carrier made naval battles possible between fleets which were hundreds of miles apart in which the opposing forces never even saw one another!