Easy Puzzles 

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

Workings

Hint
The missing word is in these locations: LO---E, ---CH, S---HE, ---ER, VA---E.

Answer
Cat.
loe  = locate ch   = catch she  = scathe er   = cater vae  = vacate