(1).A car on the cross road is moving to...

(1).A car on the cross road is moving towards east at a speed of `40`km/hr.Another car which is `1km` south of the crossing is approaching the crossing with the same speed.Their closest distance of approach will be
(1) `1km`
2) `(1)/(sqrt(2))km`
(3) `sqrt(2)km`
(4) `2sqrt(2)km`

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(1).A car on the cross road is moving towards east at a speed of `40`km/hr.Another car which is `1km` south of the crossing is approaching the crossing with the same speed.Their closest distance of approach will be (1) `1km` 2) `(1)/(sqrt(2))km` (3) `sqrt(2)km` (4) `2sqrt(2)km`

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(1).A car on the cross road is moving towards east at a speed of `40`km/hr.Another car which is `1km` south of the crossing is approaching the crossing with the same speed.Their closest distance of approach will be
(1) `1km`
2) `(1)/(sqrt(2))km`
(3) `sqrt(2)km`
(4) `2sqrt(2)km`