Gwen got home from walking her dog at 10:30 a.m.

She walked her dog around the park for 23 minutes, down the street for 12 minutes, and up the block for 20 minutes.
What time did she start walking her dog?

A.9:15 a.m.

B.9:35 a.m.

C.9:05 a.m.

D.9:30 a.m.

To find out what time Gwen started walking her dog, we need to subtract the total duration of her walks from the time she got home.

Total duration of walks = 23 minutes + 12 minutes + 20 minutes = 55 minutes

10:30 a.m. - 55 minutes = 9:35 a.m.

Therefore, Gwen started walking her dog at 9:35 a.m.

Answer: B. 9:35 a.m.

To find out what time Gwen started walking her dog, we need to calculate the total time she spent walking.

She walked her dog around the park for 23 minutes.
She walked her dog down the street for 12 minutes.
She walked her dog up the block for 20 minutes.

To find the total time she spent walking, we add these three times together:

23 minutes + 12 minutes + 20 minutes = 55 minutes.

From the given information, we know that Gwen got home from walking her dog at 10:30 a.m.

If we subtract the total time she spent walking (55 minutes) from when she got home (10:30 a.m.), we can determine the time she started walking:

10:30 a.m. - 55 minutes = 9:35 a.m.

Therefore, Gwen started walking her dog at 9:35 a.m.

The answer is B. 9:35 a.m.