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Two cars of the same mass drive with the same speed of 60 miles per hour....

Two cars of the same mass drive with the same speed of 60 miles per hour. They approach each other at an angle of 90 degrees. What is the speed (in miles per hour) of the two cars, after they undergo a completely inelastic collision and continue to move jointly into the 45 degrees direction? (Moving jointly into the 45 degrees direction means that after the collision the two cars move together into the direction right between the directions of the two cars prior to the collision.)

A: 15 B: 30. C: 42 D: 60. E: 85

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