The velocity of a boat relative to wate...

The velocity of a boat relative to water is `3hati+4hatj` and that of water relative to the earth is `hati-3hatj`. Then the magnitude velocity of the boat relative to the earth, if `hati` and `hatj` represent velocities of 1 km/h East and North respectively is

`sqrt(17)` km/h

`sqrt(15)`km/h

`sqrt(13)`km/h

`sqrt(19)`km/h

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