Bea Debest, Ima Slo, and Betsy Luzes run in a 200 meter race. When Bea crosses the finish line, Ima is 10 meters behind Bea. When Ima crosses the finish line, Betsy is 10 meters behind Ima. If all 3 runners ran at a constant speed, how far was Betsy from the finish line when Bea won the race?
Answer choices:
(A) 18 meters (B) 19 meters (C) 19.5 meters (D) 20 meters (E) 21.5 meters
I picked D.