The arnold family arrived ar the beach at 10:30 A. M. Thay spent 3 3/4hours there. What time dud they leave the beach?

In order to answer this you first will add 3 hours to 10:30, this is 1:30. Then you need to know what 3/4 of an hour is. An hour is 60 minutes so you just break it into 4 parts, that is 15 minutes per part. so 15 times 2 equal 45 minutes. You add that to 1:30 and get 2:15. That means the arnold family left the beach at 2:15 pm.

The arnold family arrived at the beach at 10:30 A. M.

10:30

Add 3 hours and 3/4 minutes to that

3/4 = 75% of 60

.75 * 60 = 45

3 hours and 45 minutes

10:30 >> 3 hours more = 1:30

1:30 + 45 mins = 2:15

Answer would be: They left at 2:15