Let the distance travelled by a man be D km According to the question, Total time taken = 2 hrs 40 min = 4(40/60) = 14/3 hours Total time = T1 + T2 D/12 + D/9 = 14/3 (3D + 4D)/36 = 14/3 7D/36 = 14/3 D = 24 km
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