Block's colliding at some height!

In a physics lab, a small cube slides down a friction-less incline as shown in figure, it strikes elastically and horizontally with another cube that is only one-half of its mass. If the incline is 20cm20 cm high and the table is 90cm90 cm off the floor, big and small cubes strikes the ground at a distance xx & yy meter respectively from the table . Then yx\large \frac{y}{x} equal to

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