Daily Math Puzzle: 2026-08-15

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2026-08-15

A wildlife rescue team needs to save a small, helpless otter stranded on a tiny island in the middle of a wide, swift-flowing river. They have an inflatable boat (big enough for one person and the otter) but no paddles, and the current is far too strong to navigate by hand. They also have a single, very long, strong rope and a heavy rock. The island is too far from the bank to throw the rock onto it directly. How does the rescue team safely get to the otter and bring it back to shore?

A. A strong swimmer ties the rope around their waist, attempts to swim to the island, and pulls the boat across.B. They tie one end of the rope to the heavy rock and the other end to the boat. A rescuer gets in the boat, pushes off, and throws the rock downstream of the island, letting it anchor, then pulls the boat against the current towards the island.C. They tie one end of the rope to the heavy rock and a rescuer takes the other end into the boat. The rescuer then pushes off from the bank and drops the rock into the river upstream of the island, allowing the current to swing the boat in an arc towards the island.D. They construct a makeshift sail using clothing and branches to harness the wind and steer the boat to the island.

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Solution

C. They tie one end of the rope to the heavy rock and a rescuer takes the other end into the boat. The rescuer then pushes off from the bank and drops the rock into the river upstream of the island, allowing the current to swing the boat in an arc towards the island. — The key is to use the strong current to their advantage rather than fight it directly. The rescuer ties one end of the long rope to the heavy rock and takes the other end, along with the inflatable boat, to the riverbank. After pushing off, the rescuer drops the heavy rock into the river *upstream* of the island. As the rock sinks and anchors itself to the riverbed, the boat becomes tethered to a fixed point upstream. The strong current will then push against the boat, causing it to swing in a wide arc, like a pendulum, directly towards the island. Once the otter is rescued, the rescuer can use the same principle to swing back towards the original bank or a safe point downstream by manipulating the rope or releasing the anchor.

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