What is wrong with this road sign:

Memphis 7 mi (11.263 km)?

Solution: 4Q

The problems with the road sign is:

It is not correct to express the term with its significant figures as mentioned in the sign.The metric system of length is expressed with 3 significant figures which is wrong.

(In addition 7miles = 11.27 km)

The correct sign should be

BOSTON 7mi (11km)

2) Also the precision of the two measurements are...