It depends what time of day it is.
63 feet
In therory, infinitely long. In practice, the shadow will fade into dispersed light.
3
Inches of shadow = 5/6x12 10 inches
25 ft
The tree is 25 feet tall. A 5 foot pole cast a 2 foot shadow. This means that the sun angle causes the shadow to be 2/5 the length of the object casting it. The tree's shadow is 10 feet tall. Multiply 10 feet by 5/2 (inverting the fraction because we're going the other way) and we get 25 feet.
10 : 13
The ratio of the shadow cast to the height of an object will be the same at the same time of day. For the fence post, the height of the post is 2.5 times the length of the shadow ( 5 ft / 2 ft = 2.5 ) The tree has a 10 foot shadow, so using the same ratio for the fence post: 10 ft * 2.5 = 25 feet. The tree is 25 feet tall
Moon Shadow is 5' 10".
10.'384615' (recurring decimals) feet
140*10/6 = 233.33... ft or 233 ft 4 inches. Except at that distance, the end of the shadow would be too diffuse to measure accurately.
5 foot 10 inches = 70 inches