Hi! Let's analyze the sentences attached in the image:
False. They just maintain a constant elevation at 11100feet (15min) and at 2800feet (15min), while they spent 90 minutes decreasing.
False. They just maintain a constant elevation at 11100feet (15min) and at 2800feet (15min), while they spent 60 minutes increasing.
True. They spent 90 minutes decreasing and 60 minutes increasing. So, 90>60.
False. They spent 60 minutes increasing and 90 minutes decreasing, so 60<90.