The correct form is in an hour's time.
Since the letter h is silent in the word hour, the correct article to use is an, with hour. It took me an hour to get there.
Minute.
"See you in an hour and a few minutes, Manila." is better.
This has no physical meaning. The correct unit for power is the watt (not watt per hour).
The correct form is in an hour's time.
Since the letter h is silent in the word hour, the correct article to use is an, with hour. It took me an hour to get there.
This sentence is grammatically correct.
Both are correct.
Minute.
No, it is correct grammar, not a correct grammar.
If the 'hr' is referring to the word 'hour' then yes, it is grammatically correct. When deciding whether to use 'A' or 'An', it depends on the pronunciation, not the letter used. In the word 'hour' you do not pronounce the 'h', so it sounds like it starts with an 'o', so you would use 'an'.The abbreviation 'an hr' is not grammatically correct. It should be written 'an hour/An hour'. Sometimes 1hr or 2hrs is okay depends on the situation.
miles per hour, though it doen't really matter.
Yes, that is correct.
A broken clock is correct twice a day. This is because a clock with hands that are stuck will still display the correct time at least twice a day when the hour and minute hands align with the correct time.
While holding the clock button in, press the hour until correct hour is displayed and then press minute until correct minute is displayed.
"See you in an hour and a few minutes, Manila." is better.