I got the same answer as them and gave the correct math for the problem. Perhaps I read the question in the right context rather than looking at it dogmatically. So I would probably say it is the ability of an Instructor to look at the big picture...
However as my teenagers say - 'whatever'......
Originally Posted by BoseX
1013-992 = 21mb
21mb x 30 = 630ft
630 + 968 = 1598ft