Difficult Riddles

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Marking mortal privation, when firmly in place. An enduring summation, inscribed in my face. What am I?
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Two cyclists began a training run, one starting from Moscow and the other starting from Simferopol. When the riders were 180 miles apart, a fly took an interest. Starting on one cyclists shoulder, the fly flew ahead to meet the other cyclist. After reaching him the fly then turned around and yet back. The restless fly continued to shuttleback and fourth until the pair met; then settled on the nose of one rider. The flys speed was 30 mph. Each cyclist speed was 15 mph. How many miles did the fly travel?
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Using only brackets, parentheses, and these signs +,-, X, /. How can you express 100 with 5 1’s and express 100 three ways with five 5’s?
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My first is a creature whose breeding is unclear. My second, a price you must pay. My whole can be found in the river of Time and refers to events of today. What am I?
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If you like pretty gems that sparkle and shine, I invite you to dig in my virtual mine. My first is purple, fit for a king, My second is green where Dorothy did her thing. My third is red, July’s birthstone as well, My fourth is seen in strings and is found inside a shell. My fifth is hard, pure Carbon, and expensive to buy, My sixth is Crocidolite, striped like the big cat’s eye. Seventh is two words, a man-made fake of April’s stone, Eighth is very dark and found at Lightning Ridge alone. Now take from each gem, one letter in its turn, And you will find the stuff for which even the gods yearn. What am I?
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The title of the problem tells you how to approach these four questions. (A). A bus leaves Moscow for Tula at noon. An hour later a cyclist leaves Tula for mosco, moving slower than the bus. When the bus and cyclist meet, which one of the two will be farther from Moscow? (B). Which is worth more: a pound of $10 gold peices or half a pound of $20 gold pieces? (C). At six o’clock the wall clock struck 6 times. Checking with my watch, I noticed the time between the first and last strokes was 30 seconds. How long will the clock take to strike 12 at midnight? (D). Three swallows fly outward from a point. When will they all be on the same plane in space? Now check the answers. Did you fall into any of the traps which lurk in these simple problems?
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