Replace the question mark with a numberMATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 135
The first user who solved this task is H Tav.
#brainteasers #math #riddles
Transcontinental radio telephoneIn 1915, a transcontinental radio telephone demonstration was given in New York City. Speech was transmitted via Arlington, Va. to Mare Island at San Francisco, Cal. (2,500 miles). The same night, speech was also transmitted to Honolulu.