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A boat is moving with velocity (4hat i+6...

A boat is moving with velocity `(4hat i+6hat j)m/s` with respect to ground.The water in the river is moving with `(-3hat i-4hat j)m/s` with respect to ground.The velocity of boat with respect to water is

`(7hat i-10hat j)m/s`
`(hat i+2hat j)m/s`
`(-5hat i+7hat j)m/s`
`(-5hat i-8hat j)m/s`

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