At 6:00 A.M. the Pony Express rider leaves San Antonio for Las Cruces. His horse travels at ten miles per hour. The second Pony Express Rider leaves at 9:00 A.M. with sole objective of giving extra package for first Pony Express rider to deliver. Second rider's horse travels at 18 miles per hour. At what time will second Pony Express rider catch up to first Pony Express rider.