Clock Block Very Tricky

Algebra Level 2

In the figure below there's a clock and a circular block. The radius of the clock is 20 cm and the radius of the clock is 10 cm. The block rolls until the arrow point upwards. The point of tangency between block and clock is pointing at what time?

2 o'clock 6 o'clock 3 o'clock 4 o'clock 8 o'clock

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