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That would depend on how long your tape measure was.
Yes, but then there is no point in using an instrument that is that accurate!
the first number is usually in feet, the last number is in inches. so the last number = 1/12 of the first numbers value.
Assuming the number is written to its greatest precision, it will be half of the place of the last digit. Since the 9 is in the tenths place, the greatest possible error is ±0.5*a tenth = ±0.05 metres.
"It has been raining since last two hours" is incorrect. "It has been raining for the last two hours." "It has been raining since two hours ago."