Frank boards a train a certain distance from the coast. The train moves directly away from the coast at a constant rate. After 12 hours on the train, Frank is 673 kilometers from the coast. After 18 hours, he is 985 kilometers from the coast.
(a)Choose the statement that best describes how the time and Frank's distance from the coast are related. Then fill in the blank.
As time increases, Frank's distance from the coast decreases.
what is kilometers per hour
As time increases, Frank's distance from the coast increases.
what is kilometors per hour
(b)How far was Frank from the coast when he boarded the train?
(b) We can find the answer by finding the difference in distance between the two given times.
The difference in distance between 12 hours and 18 hours is 985 km - 673 km = 312 km.
Therefore, Frank was 312 kilometers from the coast when he boarded the train.