A Formula for Calculating the Distance $d$ , One Can See from an Airplane to the Horizon

Multiple Choice

A formula for calculating the distance, $d$ , one can see from an airplane to the horizon on a clear day is $d=1.22 x^{1 / 2}$ , where $x$ is the altitude of the plane in feet and $d$ is given in miles. How far can one see in a plane flying at 25,000 feet? Round your answer to the nearest tenth mile, if necessary.

A) 192.9 miles
B) 174.6 miles
C) 1525 miles
D) 15,250 miles