1. The problem statement, all variables and given/known data As measured in Earth's frame of reference, two planets are 491,000 km apart. A spaceship flies from one planet to the other with a constant velocity, and the clocks on the ship show that the trip lasts only 1.10 s. How fast is the ship traveling? (Enter your answer to 4 significant figures and in terms of c.) 2. Relevant equations I tried using the equation delta t=d/v and converting the km to m, but that seemed way to easy....and I got the wrong answer. Then I tried delta t=delta t o / sqrt(1-v^2/c^2), but I wasn't sure what to plug in for the variables. Assuming that I am now on the right path, would I put in 1.1 for delta t? Would I even need anything for delta t o ?