A duck is swimming at the center of a circle-shaped lake. A fox is waiting at the shore, not able to swim, willing to eat the duck. It may move around the whole lake with a speed four times faster than the duck can swim. Can the duck always reach the shore without being eaten by the fox?
Source: Raphael Reischuk Riddles
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Die duck die….if r radius of lake…duck covers r while fox can cover 4r..fox has to cover max (22/7)r which is less then 4r so she will catck eat d duck 😛