Question

Carly says she walks 300 millimeters to school each day. is it reasonable.explain

Answer 1

 No, as 300 millimeters is only 30 centimeters, which in turn is only 11.811 inches. It is very improbable that she would only need to walk 11.811 inches to school each day.
  Hope this helps.

Answer 2

Answer: The statement is not reasonable.

Step-by-step explanation:

First, 1 millimeter is equivalent to a (1/1000) meters = 0.001 meters

so if Carly says that she walks 300 millimeters, she is walking:

300*0.001 meters = 0.3 meters

This would mean that she lives at a distance of less than half a meter of the school, which has no sense, so the statement is not reasonable.