A mountain route agency has a defined trip to travel from village A to village B, separated by summit C.

According to the agency's experience:

• It takes 18 hours to reach village B from A by going around summit C.

• It takes 3 hours to climb from village A to reach summit C.

• It takes 6 hours to ascend by trekking from village A to summit C.

• It takes 2 hours to descend by rappelling from summit C to village B.

• It takes 5 hours to descend by trekking from summit C to village B. 

A group of clients who have booked the route from village A to B prefer to arrive as quickly as possible, and according to the agency's experience, based on the people in the group:

• There is a 100% probability of reaching the destination by going around the summit.

• There is a 30% probability of successfully reaching the summit by climbing and a 70% probability of doing so by trekking (ascending).

• Once at the summit, there is a 20% probability of descending by rappelling to village B and a 70% probability of reaching village B by trekking (descending).

The group of clients prioritizes reaching village B as quickly as possible.