Four children are in the four corners of a 10 m × 25 m pool.
Their coach is standing somewhere on one side of the pool. When he calls them, three children get out and walk as short a distance as possible round the pool to meet him. They walk 50 m in total.
What is the shortest distance the coach needs to walk to get to the fourth child’s corner?
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Grey Kangaroo 2020 (2020)
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