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Find number abc

If 7a648 - b6647 = 45cca find number abc. Multiple solutions may exist.

Correct answers: 29

The first user who solved this task is Nasrin 24 T.

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I just love wind. It...

“I just love wind. It blows me away.”

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Railroad safety

In 1870, Thomas S. Hall of Stamford, Conn., received a patent for the first automatic electric block railroad signal system in the U.S. (No. 103,875). When a train entered a block of track, Hall's electromagnetic device automatically set a signal when the locomotive struck a lever fastened to the rail. The signal was set to danger until the train cleared the block. After Hall invented the device in 1867, it was tried out on the New York and Harlem Railroad.

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