Final answer:
The height of the phone tower is 18 m.
Step-by-step explanation:
To find the height of the phone tower, we can use similar triangles. Let's label the height of the phone tower as 'h'. We have the following ratios:
Bob's height to his shadow's length: 1.8 / 6 = h / 60
Cross-multiplying and solving for 'h', we get:
h = (1.8 / 6) * 60
h = 18 m
Therefore, the height of the phone tower is 18 m.