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how do you do this?

How to do this?? ------------------------- The diagram shows a junction in a circuit where three wires P, Q and R meet. The currents in P and Q are 1 A and 3 A respectively, in the directions shown. How many coulombs of charge pass a given point in wire R in 5s? A) 0.4 B) 0.8 C) 2 D) 10