To find out how long Keiko played with her dog, we can subtract the start time from the end time.
Start time: 7:45 a.m.
End time: 8:18 a.m.
To calculate the duration:
- From 7:45 to 8:00 is 15 minutes.
- From 8:00 to 8:18 is an additional 18 minutes.
Now, we add those two intervals together:
15 minutes + 18 minutes = 33 minutes.
Therefore, Keiko played with her dog for 33 minutes.