How will you write $1.11$ hours in hours, minutes and seconds?

Let's break down $1.11$ hours into smaller time elements:
$$1.11\text{hours}=1\text{hour}+0.11\text{hours}$$
Convert the decimal portion ($0.11$ hours) into minutes:
$$0.11\times 60\text{minutes}=6.6\text{minutes}$$
This gives $6$ full minutes plus a remaining decimal of $0.6$ minutes.Convert the remaining decimal fraction ($0.6$ minutes) into seconds:
$$0.6\times 60\text{seconds}=36\text{seconds}$$
Combining all the parts together: 1 hour, 6 minutes, 36 seconds.