The Johnson arrived at the restaurant at 5:30 they left at 7:15 how long did it take them to eat dinner.

Answer: 1 hour and 45 min

Step-by-step explanation:

From 5:30 to 6 is 30 min

From 6 to 7 is 1 hour

And finally from 7 to 7:15 if 15 min

If we add all of the times up, we get 1 hour and 45 min, so it took them an hour and 45 min to eat dinner