Answer: Train 2 is traveling 4 miles per hour faster than train 1.
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Answer:
option 2 I think sorry if its incorrect
Start with

Add 2x to both sides:

Subtract 21 from both sides:

Divide both sides by 5. Since it is positive, we don't have to change the inequality sign:

So, the answer is 
Answer: 2
Step-by-step explanation: