A truck and a school bus both left Edmonton at the same time. The truck drove North 500 km and the school bus drove East 365 km. The bus travelled 20 km/h slower tha arrived at its destination 1 hour before the truck arrived at its destination. If x represents the speed of the truck, which of the following equations could be used to determine x? Select one: O A. 365 +1= 500 x -20 O B. 365 +1 = 500 x-20 DC. 500 +1= 365 D. 500 +1 = 365 -20 x