Two horses started simultaneously towards each other and meet each other 3 hr 20 mins later. How much time will it take the slower horse to cover the whole distance if the first arrived at the place of departure of the second 5 hours later than the second arrived at the point of departure of the first?

• A. 10 hours
• B. 5 hours
• C. 15 hours
• D. 6 hours
• E. None of these