Easy Puzzles 

Workings

Hint
Be careful with the middle of the last word.

Answer
Business.
Committee.
Sincerely.
Archaeologist.

Workings

Hint
The word begins with the letter W.

Answer
Water.

Watercolour, watercress, waterfall, waterproof, watershed, waterway.

Workings

Hint
There are three feet in a yard, and 1,760 yards in a mile.

Answer
Seconds in a week.

Reasoning
There are 60 x 60 x 24 x 7 = 604,800 seconds in a week.

There are 3 x 1760 x 100 = 528,000 feet in 100 miles.

Workings

Hint
Think of Roman numerals.

Answer
Delta.

Take the Roman numerals in sequence, and convert to the phonetic alphabet.
  1 = I = India
  5 = V = Victor
 10 = X = X-Ray
 50 = L = Lima
100 = C = Charlie
500 = D = Delta