Your 1.2 hours is 1 hour and 12 minutes, or 72 minutes. You know an hour is 60 minutes, so 0.1 hours is 6 minutes. You can work that in your head. If 0.1 hours is 6 minutes, then 0.2 hours is twice that, or 12 minutes. The 1 hour, the 60 minutes, plus 12 minutes is 72 minutes. You don't need a calculator for this one.
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About 12 hours and 25 minutes.
13 hours and 15 minutes.
4 hours 12 minutes
Seven hours between 12 o'clock and 7 o'clock.
Mars has a similar day length to Earth, with approximately 24 hours and 37 minutes in a Martian day. Of this, around 12 hours and 12 minutes are daylight hours and the remaining time is darkness.