An express bus left town a at 18: 15 hours and reached town b at 21: 05 hours. how long did the journy take?

Hi!

Let's make a small chart

18:15 left town B
19:15 1 hour
20:15 2 hours
21:15 3 hours 

Since they actually arrived at 21:05, and not 21:15, we know it took more than 2 hours, but less than 3 hours. 

Subtract the extra time
21:15-21:05 = 00:10

Since there are 60 minutes in an hour, (60-10=50) we know it took 2 hours and 50 minutes. 

Another way to solve this would be to convert the times to decimals, and subtract,
21.05-18.15 = 2.9
Then convert the decimal to the time. 

9/10 of an hour = 50 minutes
It took 2 hours and 50 minutes

Hope this helps! :)

It would take 2 hours and 50 minutes to get to town B

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In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.