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Two-dimensional kinematics colliding cars

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Two cars lost in a blinding snowstorm are traveling across a large field, each thinking they are on the road, as shown in the figure on the left. They collide. If the distance x is 124 meters and the red car is travelling at 12.7 mph, how fast to the nearest hundredth of a mph was the blue car travelling?

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I would start from writing down some notations and reviewing what is given:

Let
v_r = 12.7 mph = 12.7 mile/hour * 1609.344 m/mile / (3600 s/hour) = 5.6674 m/s
be the speed o the red car and
v_b = ?
be the speed of the blues car.

Let us also assume the usual coordinate system: X-axis horizontally from ...

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