Science Buddies: "Ask an Expert"

Got a puzzle which I need help, please.

Which city is closer. (Manchester or Leeds) from someone living near Leeds it will be the Leeds. Will distance = speed x time work in that? But what if your traveling at the speed of light. So if there is a sunrise which city will the Sun light reach first. place?

Is there a simple equation to help understand and explain to someone else?

The Science Buddies "Ask the Expert" forum is for students in grades K-12 who are doing science projects. If you are doing a science project and need help, please tell us more details about your experiment, including your hypotheses and how you plan to conduct an experiment to test your hypotheses. If you are not doing a science experiment, then there are other places on the web where your questions would be more appropriate. Thank you.