To determine the latest time Sally can leave her house in order to arrive in Sulverton by 10:15, we need to analyze the timetable and backward calculate from her required arrival time.
1. According to the timetable, the trains arriving in Sulverton before 10:15 are as follows:
- 9:56 train.
2. Let's check the departure time of the 9:56 arrival in Sulverton from Hudderslet:
- The 9:56 arrival in Sulverton departs from Hudderslet at 9:32.
3. Since Sally's house is a 10-minute walk from Hudderslet station, she must leave her house 10 minutes before the train's departure:
- 9:32 - 10 minutes = 9:22.
Thus, the latest time Sally can set off walking from her house is **9:22**.