Asailor judges the distance to a lighthouse by holding a ruler at arm's length and measuring the apparent height of the lighthouse. he knows that the lighthouse is actually 60 feet tall. if it appears to be 3 inches tall when the ruler is held 2 feet from his eye, how far away is it? 60 feet 120 feet 240 feet 480 feet 960 feet

480 ft

Step-by-step explanation:

We can use Similarity of Triangles.

           | lighthouse                                    

60 ft     |                                                     ruler

           |                     3 in |__        

                    x                                         2 ft

3 inches = 0.25 ft

60/0.25 = x/2

0.25x = 120

x = 120/0.25

x = 480 ft

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation: