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Question

The Speed of the ship in calm water is five times the speed of the stream. If the ship can travel 's + 30' km downstream or 's - 10' km upstream in 5 hours, determine the time it takes for the ship to cover '4s - 170' km in still water.

A 11 hrs 30 mins

B 12 hrs 40 mins

C 5 hrs 25 mins

D 9 hrs 30 mins

E none of these

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