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Speed of the boat in still water and the downstream speed of the boat are in the ratio of 5:6 respectively. The boat covers 80 km upstream and 72 km downstream in 8 hours. Find the time taken by the boat to cover 150 km in still water.

A 7.5 hrs

B 8.5 hrs

C 3.5 hrs

D 2.4 hrs

E None of these

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