A boat moves downstream at the rate of 1 km. in 7.5 minutes and upstream 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 downstream at the rate of 1 km. in 7.5 minutes and upstream at the rate of 5 km. an hour. The speed of boat (in km./hr.) in still water is -