Two rafters A and B are going to simultaneously cross a river on separate rafts starting from point O. Because of the turbulent water current in the river, rafters A and B reach points X and Y, respectively, to the right of point O’ on the opposite bank of the river. Suppose that the distance of point X from O’ is a uniform random variable withand, and that Y is also a uniform random variable withand. A small village V is situated 4km from O’. Whta is the probability that rafter B will be closer to the village than A when they make it across the river? Assume that X and Y are independent.