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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 ?

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