4. The Great Wall is over 4,000 miles long. If you were walking at a speed of about 4 miles per hour,
how long would it take you to walk the entire length of the Great Wall?

Do you have more info about it ? i doubt this is the answer because i don't have all the information but if trouble was brewing in a clinic maybe it was an argument as to which clinic was better or smth of that nature

Ais your correct answer