A boat moves downtream at the rate of 1 km in 7.5 minute and up stream at the rate of 5 km an hour. The speed of boat in (km/hr) in still water is.
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A boat moves downtream at the rate of 1 km in 7.5 minute and up stream at the rate of 5 km an hour. The speed of boat in (km/hr) in still water is.