The frequency of the emitted radio waves is:

The energy of a photon is given by:

where h is the Planck constant and f is the photon frequency. Using the frequency given by the problem, we can find the energy of each photon of this radiation:
That sounds correct to me.
Answer:
19 miles
Step-by-step explanation:
If they had to ride 342 split by 18 horses, divide 342 by 18 to get 19