A ship is moving at a constant of 10km/h in the direction of unit vector `hati`. Initially its position vector relative to a fixed origin is `10(-hati+hatj)`. A second ship is moving with speed `10sqrt(5)` k/h parallel to the vector `hati+2hatj` and is initially at origin. if the time to reach the minimum speration is `5alpha` minutews. Fill `alpha` im OMR sheet.

Explanation

`v_(1)=10hati km//hr`
`v_(2)=10(hati+2hatj)km//hr`
`v_(12)rArr-20hatj km//hr`
`trArr(10)/(20)rArr30` minutes