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Boatman goes 4km against current in 2hr and 7.5km along current in 90min. How long he take for 7 km in stationary water?

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A boatman goes 4 km against the current of the stream in 2 hour and goes 7.5 kms along the current in 90 minutes. How long will it take to go 7 km in stationary water?

posted May 25, 2017 by anonymous

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