Task: Question Answering
Input (English): Passage: Hoping to rebound from their divisional road loss to the Texans, the Titans went home for a crucial Week 16 battle with the Pittsburgh Steelers, with the AFC's top seed on the line. After a scoreless first quarter, the Titans got the second quarter lead as kicker Rob Bironas got a 42-yard field goal, along with quarterback Kerry Collins completing a 34-yard touchdown pass to wide receiver Justin Gage. The Steelers would respond with quarterback Ben Roethlisberger completing a 31-yard touchdown pass to wide receiver Santonio Holmes. In the third quarter, Pittsburgh took the lead as Roethlisberger completed a 21-yard touchdown pass to wide receiver Hines Ward, yet Tennessee struck back with rookie running back Chris Johnson getting a 21-yard touchdown run. The Titans would then pull away in the fourth quarter with running back LenDale White's 1-yard touchdown run and safety Michael Griffin's 83-yard interception return for a touchdown. This was the first game of the year where the league-leading Steelers defense allowed more than 300 yards of total offense (allowing 332 yards). With the win, not only did Tennessee improve to 13-2, but they also locked up the AFC's #1 seed. This would be the Titans last win until Week 8 of the 2009 season. This would also be the last time a team swept both the AFC and NFC North in the same season until the Dallas Cowboys did it during the 2016 season. 
Question: How many yards difference was  Chris Johnson’s touchdown run compared to LenDale White's touchdown run?How many yards difference was Chris Johnson’s touchdown run compared to LenDale White's touchdown run? 
Answer type: Number 
Output (English): 20.