Random Puzzles 

Workings

Hint
There are 12 inches in a foot, and 1,760 yards in a mile.

Answer
Feet in a 20-mile walk.

Reasoning
There are 12 inches in a foot, 3 feet in a yard, and 1,760 yards in a mile:

   square inches in a piece of carpet 15 yards by 5 yards
      (15 x 3 x 12) x (5 x 3 x 12) = 97,200 square inches.

   feet in a 20-mile walk
      20 x 1760 x 3 = 105,600 feet.

Workings

Hint
Look at the first and last letters.

Answer
2,300 miles.

Take the alphabetic position of the first and last letters, add them together and multiply by 100. S = 19, D = 4, 19 + 4 = 23, 23 x 100 = 2,300.

Workings

Hint
One possible answer begins with the letter A.

Answer
ark: bark, dark, market, parking, shark.

or:

ill: bill, dill, millet, pilling, shill.

Workings

Hint
There are no missing letters.

Answer
All good things come to those who wait.

The first and last letters of each word have been exchanged.