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Riddles, one at a time

One Letter Is Hiding

Which letter is hidden in the mosaic?

Picture · Medium Challenge link
Answer

K

Its tiles have 4 points or sides, not 8.

The big gear turns clockwise. Which lantern goes UP?

Video · Hard Challenge link
Answer

LANTERN C

Each mesh and the crossed belt flip the spin.

Two candles of the same height are lit together and burn at a steady rate. A lasts 4 hours, B lasts 6 hours. After how many hours is B twice as tall as A?

Video · Genius Challenge link
Answer

3 hours

After 3 h, A has 1/4 left and B has 1/2 left: twice.

Which card do you get?

Video · Easy Challenge link
Answer

D

Rotate 180°: the top row lands at the bottom, reversed. Card D.

At which step number are all three gems at the top again?

Video · Hard Challenge link
Answer

36 STEPS

Notches 9, 6 and 4: the first common multiple is 36.

How many more km until the next mirror number?

Video · Medium Challenge link
Answer

11 km

The next mirror number is 30003, just 11 km on.

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