They would arrive at the same time.
Work Step by Step
4/10 = 1.2/3 --- You live 4 miles from a park and you bike at 10 mph. Your friend lives 1.2 miles from the park and walks at 3 mph. How much earlier should your friend leave in order to arrive at the park at the same time you arrive. The ratios for both you and your friend are equal, so you both should leave at the same time.