The distance traveled can be calculated using the formula D = s · t where s is the speed and t is the total time. Which of the situations below represent a total distance of 400 km? Select all that apply.

A) 65 km/hr for 5 hours
B) 100 km/hr for 4 hours
C) 50 km/hr for 8 hours
D) 80 km/hr for 5 hours