Answer:
6 hours 45 minutes.
Explanation:
After finishing his shift, a security guard wrote "6.75 hours worked" on his time card.
We have to calculate the time the guard has worked.
Now we convert (0.75) hours to minutes
0.75 hours = 0.75 × 60 minutes
= 45 minutes.
So total worked by security guard = 6 hours 45 minutes.
He worked 6 hours 45 minutes.