A marathon runner crossed the finish line after running for 2 hours, 48 minutes, and 12 seconds. She crossed the line at 9:18:12 A.M. When did the marathon start?

• 9:18:12-2:48:12=6:30:00
• 11 years agoHelpfull: Yes(3) No(1)
• first, subtract second 12-12=0 . second, subtract minute between 18-48 whereas 18 is less then 48 therefore, it borrow 60 minutes from 9hrs due to which 18minutes convert into 78 minutes now convert 78-48=30min at last 8-2=6.
• 8 years agoHelpfull: Yes(1) No(1)