The provided code calculates and displays the approximate travel time...

August 29, 2025 at 08:53 PM

/* * Activity 1.1.5 */ public class PlanetTravel2 { public static void main(String[] args) { // theplanets.org average distance from earth int mars = 48678219; // speed of light in miles per hour int lightSpeed = 670616629; lightSpeed /= 10; System.out.println("Travel time to Mars: " + mars / lightSpeed + " hours."); } }

The provided code calculates and displays the approximate travel time to Mars if one could travel at 1/10th the speed of light. Here's what it does step-by-step:

  1. The code defines the average distance from Earth to Mars (mars) as 48,678,219 miles.
  2. It defines the speed of light (lightSpeed) as 670,616,629 miles per hour (a known constant).
  3. The light speed is then divided by 10 (lightSpeed /= 10), implying that the travel speed being considered is 1/10th the speed of light.
  4. The travel time to Mars is calculated using the formula: 
    Time = Distance / Speed
    In this case, mars / lightSpeed computes the approximate time to travel to Mars in hours.
  5. The program outputs the result as a message: 
    Travel time to Mars: X hours.
    where X is the computed travel time.

Output Example:

Given the values in the code:

  • mars = 48,678,219 miles
  • lightSpeed = 670,616,629 / 10 = 67,061,662.9 miles/hour

The travel time is approximately:

48,678,219 / 67,061,662.9 ≈ 0 hours

Since the result of integer division truncates any decimal part, the program will display:

Travel time to Mars: 0 hours.
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