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Answer:
The height of the tree is 16.67 feet.
Step-by-step explanation:
Refering the figure, let the height be "x" feet.
It is evident that triangles ABC and triangle EDC are similar.
(as both man and tree are perpendicular to the ground)
thus, 
hence,

Thus,
.
To find that subtract Jane's own from Joe's so
2/5-1/7=9/35
So Joe has eaten 9/35 more pizza than Jane
The answer would be .75. The 5 would be repeating
They are 7 points away from each other.