Answer:
[tex]1.59*10^4 s[/tex]
Explanation:
The signals sent from the earth, travel at the speed of light, therefore the travel time of the signal between the earth and neptune, can be calculated with the following equation, which relates time, speed and distance:
[tex]t=\frac{x}{v}\\t=\frac{4.76*10^{12} m}{3*10^8 m/s}=1.59*10^4 s\\[/tex]
The time elapsed is approximately 4.41 hours