^@ABCD^@ is a square with each side measuring ^@100 \space cm^@. ^@M^@ is a point on ^@CB^@ such that ^@CM = 25 \space cm^@. If ^@N^@ is a variable point on the diagonal ^@DB^@, find the least value of ^@CN + MN^@.
If Abrar drives at two third of her usual speed, she covers a certain distance in 2 hours more than the time she takes while driving at her usual speed. Find the time taken by her to cover this distance with her usual speed.