The speed of current is 5 km./hr. A motorboat goes 10 km. upstream and back again to the starting point in 50 minutes. The speed in km./hr. of the motor boat in still water is -
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The speed of current is 5 km./hr. A motorboat goes 10 km. upstream and back again to the starting point in 50 minutes. The speed in km./hr. of the motor boat in still water is -