If Lawrence walked twelve miles in six hours, he was walking two miles per hour. In 30 minutes he would have walked one mile.
Twelve thirty in the afternoon would be most correct. You cannot say twelve thirty o'clock. You only say o clock when you don't have any minutes over.
400 minutes.
at twelve thirty
10 hours and 30 minutes.
8:00am is eight hours, 8:00pm is twenty hours (20:00). 12:00am is zero hours (00:00), 12:00pm is twelve hours. 12:30am is thirty minutes (00:30), 12:30pm is twelve hours and thirty minutes. 4:30am is four hours and thirty minutes, 4:30pm is sixteen hours and thirty minutes (16:30).
one hour and forty five minutes
Thirty-two. Twenty plus twelve is thirty-two.
Twelve and thirty-two hundredths.
Convert everything to hours, or everything to minutes, then multiply. In this case, it is easier to convert everything to hours - 15h30m = 15.5 hours.
Twelve
360
Twelve and thirty four hundredths in standard form is 1.234 × 101