Final answer:
To find out how many hours it would take for the bobsled to travel 42 miles, set up a proportion based on the given information and solve for the unknown variable. The bobsled would take 6 hours to travel 42 miles.
Step-by-step explanation:
To find out how many hours it would take for the bobsled to travel 42 miles, we can set up a proportion based on the given information. We know that the bobsled can travel 21 miles in 3 hours. So the ratio of miles to hours is 21 miles / 3 hours = 42 miles / x hours. By cross-multiplying, we get 21x = 3 * 42, which simplifies to 21x = 126. Dividing by 21 on both sides, we find that x = 6. Therefore, it would take the bobsled 6 hours to travel 42 miles.