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.
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Puzzle 7
Which is larger:
centimetres in a milemiles travelled by light in a second
Hint
Light travels over 186,000 miles each second.
Answer
Miles travelled by light in a second.
Reasoning
Light travels over 186,000 miles per second.
There are 2.54 cm in an inch, 12 inches in a foot, 3 feet in a yard, and 1760 yards in a mile. So there are 2.54 x 12 x 3 x 1760 = 160,934.4 cm in a mile.
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Puzzle 8
We can add a letter to each of these words, and then rearrange to make a new 5-letter word.
For example: DENY + B = BENDY (not part of the answer!).
If the 7 added letters are an anagram of CHEMIST, what are the new words?
Answers deny + e = needymail + c = claimexit + s = existgosh + t = ghostcity + h = itchynewt + i = twinetype + m = empty
The letters ECSTHIM are an anagram of CHEMIST.
