Idont understand how to solve this geometry problem can you me ?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Jenny earned a 77 on her most recent test jenny score is no less then 5 points greater then 4/5 of terrance’s score if t represents terrance score which inequality represents the situation

Two trains leave stations 546 miles apart at the same time and travel toward each other. one train travels at 95 miles per hour while the other travels at 115 miles per hour l. how long will it take for the two trains to meet