# Math Riddles - Page 5

A shrimping boat is at the docks with a lifeboat hanging off the side 5 meters above the water. If the tides rise at a rate of 1.5 meters per hour, how long would it take for the water to reach the lifeboat.
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There are two ropes that both take exactly 1 hour to burn from end to end. You are unable to cut the rope. How can you burn the two ropes in a total of 45 minutes?
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If you have an 11 minute and 13 minute hourglass, how can you accurately time 15 minutes?
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On a clock, how many times a day do the minute and hour hand overlap?
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You have a glass of water that looks about half full. How can you tell, only using the glass of water itself, if the glass is half full or not?

The glass is a right cylinder.
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There is a chain nailed to the wall. The chain is 10 feet long and the center of the chain dips down 5 feet from where each side of the chain is nailed to the wall. How far are the 2 ends of chain from each other?
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What number do you get when you multiply all of the numbers on a telephone’s number pad?
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What 3 positive numbers give the same result when multiplied and added together?
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If 1/2 of 5 is 3, then what is 1/3 of 10?
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2 men catch 2 fish in 2 minutes. At this rate, how many men could catch 500 fish in 500 minutes?
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