The train travels at an average speed of 68 miles per hour for the first 2 hours and at an average speed of 80 miles per hour for the next 4 hours. what was the train's average speed for the 6 hour trip?

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.