*1k views**108 ratings**6 saves*

**Question: **If you have an 11 minute and 13 minute hourglass, how can you accurately time 15 minutes?

*73.9k views**76 ratings**2 saves*

**Question: **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?

*26.8k views**51 ratings**2 saves*

**Question: **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.

*97.3k views**105 ratings**2 saves*

**Question: **How many people do you need to have the odds be in favor (at least 50% chance) of two people having the same birthday?

*1k views**164 ratings**6 saves*

**Question: **Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a sports car; behind all of the others is bicycles. You pick a door, say No. 1, and the host, who knows what's behind the doors, opens another door, say No. 2, revealing a bicycle. He then says to you, "Do you want to pick door No. 3?" Is it to your advantage to switch your choice?

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