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a.) At what time will runner B catch up with runner A?

b.) If the runners stop when B catches A, how far do they run?

So far I have 4.0 m/s*300 s = 1.2 Km and 3.0 m/s x 300s= 0.9 km, but I don't even know if this is the right aproach, can anyone help me from here?