$A$ boatman goes $2\, km$ against the stream in $1\, hour$ and goes $1\, km$ along the current in $10\, minutes.$ How long will he take to go $5\, km$ in stationary water?
- A$40\, minutes$
- B$1\, hour$
- C$1\, hour\, 15\, minutes$
- D$1\, hour\, 30\, minutes$
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