Answer:11:29
Explanation:
If Doug starts at 10:47 and sweeps for 42 minutes
First you add 42 minutes to the 47.
Remember there are 60 minutes in an hour.
So do 47+42=89
Next do 89-60 (because there are 60 minutes in an hour)
You get 29 minutes.
Add one to the 10
That makes 11:29