Roy takes 1 hour 54 sec for doing his homework everyday.how much time does he spend doing his homework in a week?

(1 hr 54 sec) * 7

And yet, I suspect you meant 1 hr 54 min.

To find how much time Roy spends doing his homework in a week, we need to multiply the time he takes for one day by the number of days in a week.

First, let's convert 1 hour 54 sec to a single unit of time. Since there are 60 seconds in a minute, we can convert the seconds into minutes by dividing by 60:
54 seconds ÷ 60 seconds/minute ≈ 0.9 minutes

So, 1 hour 54 seconds is equal to 1 hour and 0.9 minutes.

Next, let's convert the 0.9 minutes into hours by dividing by 60:
0.9 minutes ÷ 60 minutes/hour ≈ 0.015 hours

Now we can add the converted minutes to the hours:
1 hour + 0.015 hours = 1.015 hours

Therefore, Roy takes approximately 1.015 hours to do his homework each day.

To find out how much time Roy spends doing his homework in a week, we multiply the time for one day by the number of days in a week:
1.015 hours/day × 7 days/week = 7.105 hours/week

So, Roy spends approximately 7.105 hours doing his homework in a week.