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Bullets are fires at regulart intervals ...

Bullets are fires at regulart intervals of 10sec. from an armoured car A moving with a speed of `36km//` hour . At what interval with an officer seated in a car B hear the report when the car B is stationary and car A is moving towards car B. Velocity of sound `=330` metre `//` sec. and velocity of wind `=10` metres `//` sec in the direction AB.

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