Average Speed

[Guest]

An excursion train has the following schedule:

9:30 AM- Departs starting point for Town A.

11:15 AM- Arrives at Town A with a 1 hr. 45 min. layover.

1:00 PM- Departs for Town B.

1:10 PM- Arrives at Town B with a 50 min. layover.

2:00 PM- Departs Town B.

3:45 PM- Arrives at starting point.

Distance:

From starting point to Town A- 31 miles.

From Town A to Town B- 3 miles.

From Town B to starting point- 34 miles.

Total Distance- 68 miles.

Calculate average speed of train.

Thanks for your assistance.