A car A going north-east at 80km//h and ...

A car `A` going north-east at `80km//h` and another car `B` is going south-east at `60km//h.` The direction of the velocity of `A` relative to `B` makes an angle with the north equal to:

`1//7`

`3//4`

`4//3`

`3//5`

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