book Maths Puzzle Numerical Ability

At 10am a car leaves a house at a rate of 60 mph. At the same time another car leaves the same house at a rate of 50mph in the opposite direction. At what time will the cars be 3

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Can you please help me solve {4x+2y=7
{y=5x In rectangle WXYZ, diagonal WY=x-2 and diagonal XZ = the square root of x. Find x and the length of the diagonals of WXYZ.