Question

Two runners A and B stand at opposite ends M and N of a straight track. A begins toward N at (x – 6) km/h. Four hours later, B starts toward M at (x + 6) km/h. They meet at the midpoint of MN. If MN = 576 km, determine how long A would take to cover the entire MN.

A 18 hrs
B 20 hrs
C 12 hrs
D 24 hrs
E None of these
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