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A boat man goes 2 km against the current...

A boat man goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water? a. 40 minutes       b. 1 hour      c. 1 hr 15 min        d. 1 hr 30 min

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