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The speed of a boat while going downstream is 24 km/h, and while going upstream, it is 16 km/h. If the boatman takes 12 hours to cover (m +
n) km upstream when the stream flows at twice its normal speed, find the average of m and n.

A 72 km

B 60 km

C 93 km

D 85 km

E None of these

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