Write an article that answers the following question: How many touchdown passing yards did Rivers have during the first quarter?
Hoping to rebound from their home loss to the Broncos, the Chargers flew to Arrowhead Stadium, donned their throwbacks, and played a Week 7 AFL Legacy game with the Kansas City Chiefs.  In the first quarter, San Diego struck first with quarterback Philip Rivers competing a 3-yard touchdown pass to wide receiver Malcom Floyd and a 10-yard touchdown pass to wide receiver Vincent Jackson.  The Chargers would continue their dominance in the second quarter as kicker Nate Kaeding nailed a 20-yard and a 39-yard field goal. The Chiefs would get on the board in the third quarter with quarterback Matt Cassel completing a 7-yard touchdown pass to wide receiver Dwayne Bowe, yet San Diego came right back with Rivers hooking up with running back Darren Sproles on a 58-yard touchdown pass.  Afterwards, the Chargers would wrap up the game in the fourth quarter with Kaeding booting a 19-yard field goal and fullback Jacob Hester recovering a blocked punt in the end zone for a touchdown.