André, Benoit and Gisèle can each walk at 5 km/h.

They have a tandem bike on which they can travel at 25 km/h.

The tandem bike can be used by one person or two persons at a time but not three.

Regardless of the number of persons on the bike it maintains a speed of 25 km/h.

Find the minimal time for the THREE of them to reach a point 100 km away.

Assume no time loss starting, stopping or turning.

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