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A boat travels from point 'T' to point 'S' downstream and returns upstream in a total of 32 hours. The speed of the boat in upstream is three times the speed of the stream. The distance between 'S' and 'T' is 240 km. Based on this information, calculate the time it would take for the boat to cover 320 km in still water.

A 36 hours

B 18 hours

C 16 hours

D 20 hours

E None of these

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