Jack and Jill ran a 400 meter race. Jill ran the race in in 50 seconds and won by 10 ​meters; that is Jack had run only 390 meters when Jill crossed the finish line. They decide to race​ again, but this time Jill starts 10 meters behind the starting line. Assuming that both runners run at the same pace as​ before, who will win the second race and by how many​ seconds?