Quick Answer. An average person can walk one mile on a flat, well-groomed surface in 17 to 20 minutes. A fit person walking briskly can walk a mile in 13 minutes. An estimated average walking speed for calculating how long a hike or walk will take is around 3 miles per hour. Continue Reading.
4. Health Conditions. If your nails are brittle it may be a sign that you are getting an inadequate amount of oxygen to the feet, which can signal a respiratory issue such as asthma. Psoriasis can mimic the symptoms of a fungal infection in the toenails, causing them to become brittle or fall off. Hyperthyroidism or hypothyroidism can also cause the nails to split or separate easily. Dehydration, alopecia areata or eczema can also cause the nails to become brittle.
Back to Top Causes. Injury: 1  Crushing the base of the nail or the nail bed may cause a permanent deformity. 2  Chronic picking or rubbing of the skin behind the nail can cause a washboard nail.3  Long-term exposure to moisture or nail polish can cause nails to peel and become brittle.ust like the skin, the fingernails tell a lot about your health. 1  Beau's lines are depressions across the fingernail. 2  These lines can occur after illness, injury to the nail, and when you are malnourished.