HarveyKlaus wrote:
A certain train traveled from Station A to Station B. Was the train's average speed on the trip less than 110 km per hour? (1km = 1000m)
(1) The train's average speed on the trip was greater than 25 meters per second.
(2) The train's average speed on the trip was less than 30 meters per second.
Convert 110km/h in meters per second => (110*1000m)/3600seconds=110000/3600 ~
30,6 m/sSo the questions is: Was the train's average speed less than 30,6m/s?
(1): Speed>25m/s. Not sufficient, it could be 26m/s when the answer is YES, or 35 m/s which means NO.
(2) Less than 30m/s. Sufficient, as 30m/s < 30,6 m/s so the train's speed was less than 30,6m/s.
Answer:
B