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A boat takes 6 hours less to travel a di...

A boat takes 6 hours less to travel a distance downstream than to travel the same distance upstream. If the speed of the boat in still water is 9 km/hr and speed of stream is 3 km/hr. Find the total distance covered by the boat.

A

150 km

B

144 km

C

140 km

D

134 km

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