中等MATH-NUMB-012
A car travels 180 km in 2 hours 15 minutes. What is its average speed in km/h?
A. 90
B. 83.7
C. 80✓ 答案
D. 40
解說
2 hours 15 minutes = 2.25 hours, and 180 / 2.25 = 80 km/h. The value 90 ignores the 15 minutes. About 83.7 comes from treating the time as 2.15 hours.