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The yellow spoke on the drive 13-gear will be vertical in 2 more cogs. After that, in how many full turns of this wheel will both yellow spokes point upwards?

Remember that meshing wheels turn in opposite directions.

 

The 11-wheel is 5 cogs from having a vertical yellow spoke. In how many full turns of the drive wheel will both yellow spokes point upwards?

 

The 13-wheel is one cog from a vertical yellow spoke. In how many full turns of the drive 11-wheel will all yellow spokes point upwards?

 

Solution

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