Kosin work and residence in Bangkok. He wants to visit his mother.The province. The drive itself at speeds averaging 90 miles per hour.Distance of approximately 780 kilometers from Bangkok to Nakhon Si Thammarat.Kosin calculated at the desired time. During the trip, the 20%.The total driving time Kosin be required to travel and stay there a few hours a few minutes.โจทย์คณิตศาสตร์