A communications company is laying cable underground between 2 subdivisions, A and B, on opposite sides of a river which is 150 metres wide. Subdivision B is 1400 m downstream from A and on the opposite bank. It costs $50/m to lay cable underground and $130/m to lay cable underwater. What is the least costly way to lay cable?

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A communications company is laying cable underground between 2 subdivisions, A and B, on opposite sides of a river which is 150 metres wide. Subdivision B is 1400 m downstream from A and on the opposite bank. It costs $50/m to lay cable underground and $130/m to lay cable
underwater. What is the least costly way to lay cable?

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