Random Puzzles 

Workings

Hint
One of the names is MEL.

Answer
demi----     + john  = demijohn
---ple       + sam   = sample
absor---t    + ben   = absorbent
he---che     + ada   = headache
sc----r      + anne  = scanner
----ionaire  + bill  = billionaire
break---ce   + dan   = breakdance
monog---     + amy   = monogamy
-----incense + frank = frankincense
s---ly       + mel   = smelly

Workings

Hint
You can remove the Y from ENERGY and rearrange.

Answers
energy   - y = green oregano  - o = orange clearest - e = scarlet weight   - g = white outlive  - u = violet embark   - k = amber calmer   - l = cream solemn   - s = lemon voiding  - v = indigo archery  - a = cherry

Workings

Hint
It doesn't matter what the distance is, so try a random distance.

Answer
This cannot be done.

It does not matter how far the trip is, let's assume that it is random distance, say 60 miles, and remembering that Time = Distance ÷ Speed.

The morning trip took 60 miles ÷ 30 mph = 2 hours.

To average the required 60 mph, we would have to travel the total distance (of 120 miles) in 2 hours. However, we've already used all of the two hours for the morning trip!

Choosing any random distance would also show that it can't be done.

Workings

Hint
Do the words make sense when read another way?

Answer
Nwod.

Opposites reversed: big, small: open, closed: up, down.