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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 269

The first user who solved this task is Rutu Raj.

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What's the trick?

A man went to the police station wishing to speak with the burglar who had broken into his house the night before.

"You'll get your chance in court," said the desk sergeant.

"No, no, no!" insisted the man. "I want to know how he got into the house without waking my wife. I've been trying to do that for years!"

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First U.S. traffic tunnel under a river

In 1866, work began on the first traffic tunnel under a U.S. river, the Washington Street Tunnel in Chicago, Illinois, under the Chicago River. It was built to alleviate traffic congestion at the river's swing bridges and opened 1 Jan 1869. It had a total length of 1,605-ft including approaches. It had a double arch with two roadways 13-ft wide by 11-ft high, and a separate footway on one side 10-ft wide by 10-ft high, reached by stairs. Cable car companies used the tunnel from the 1880's to 1906. To give a deeper draft to the river, it was replaced with a deeper tunnel in 1900, through which electric streetcar service began in 1911-12. The tunnel was closed in 1953. The world's first tunnel under a waterway was the Thames Tunnel, London, opened on 25 Mar 1843.«[Image: Washington Street Tunnel from an undated stereo viewer card.]

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