Three children are standing together on a totally frictionless frozen pond. However, their combined mass of 130 kg is starting make the ice crack. They push against each other in an attempt to escape to the edge of the pond. Child 1 has a mass of 50 kg and ends up moving north at 4 m/s. Child 2 has a mass of 30 kg and ends up moving east at 5 m/s. What is the speed and direction of child 3?

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