On a two-lane road, car A is travelling ...

On a two-lane road, car A is travelling with a speed of `36 km h^(-1)`. Two cars B and C approach car A in opposite directions with a speed of `54 km h^(-1)` each. At a certain instant, when the distance AB is equal to AC, both being 1 km, B decides to overtake A before C does. What minimum acceleration of car B is required to avoid an accident ?

`1m//s^2`

`2m//s^2`

`3m//s^2`

`4m//s^2`

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