The other one asked me a puzzle about two carts placed on a track with sensor below them. You can start cart with specific speed but afterwards you can control the motion only when cart passes sensor and when it leaves again you have no control over cart

The other one asked me a puzzle about two carts placed on a track with

1.	The other one asked me a puzzle about two carts placed on a track with sensor below them. You can start cart with specific speed but afterwards you can control the motion only when cart passes sensor and when it leaves again you have no control over cart
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