Puzzle 233
Last week I travelled from London to Leeds, a distance I measured as 174 miles.
I started at 9.15am and completed the journey with an average speed of 40 miles per hour.
On the way back, in the evening, I travelled exactly the same route, starting at 5.15pm. The traffic was light, and I completed the journey with an average speed of 60 miles per hour.
What was the overall average speed for the round trip?
The answer is not 50 mph.
Puzzle Copyright © Kevin Stone
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Hint
Remember that Time = Distance ÷ Speed, and Speed = Distance ÷ Time.
Answer
48 miles per hour.
Reasoning
Using:
Time = Distance ÷ Speed
Speed = Distance ÷ Time
The outward journey took 174 miles ÷ 40 mph = 4.35 hours.
The return journey took 174 miles ÷ 60 mph = 2.9 hours.
So I travelled a total of 2 x 174 = 348 miles. I did this in a total of 4.35 + 2.9 = 7.25 hours.
My overall average speed was therefore 348 miles ÷ 7.25 hours = 48 miles per hour.
Puzzle 234
What letter is missing from this sequence:
A · B · G · D · E · ? · E
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Hint
This is quite a common alphabet.
Answer
Z.
From Zeta, first letters of the Greek alphabet, alpha, beta, gamma, delta, epsilon, zeta, eta.
Puzzle 236
Below you will find 15 well-known six-letter words, with only their endings remaining.
Can you find the words?
---amt
---nue
---rtz
---oze
---mth
---iek
---gry
---thm
---koo
---spy
---sip
---lem
---uid
---tyr
---meg
Puzzle Copyright © Kevin Stone
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Hints
The first 6 words begin with the letters D, A, Q, S, W, S.
Answers
---amt = dreamt
---nue = avenue
---rtz = quartz
---oze = snooze
---mth = warmth
---iek = shriek
---gry = hungry
---thm = rhythm
---koo = cuckoo
---spy = crispy
---sip = gossip
---lem = emblem
---uid = liquid
---tyr = martyr
---meg = nutmeg
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