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“There” to refer to a place that isn’t here. “Their” indicates possession – something belonging to them. In this sentence, replace "there" with "their".
A boat takes half the time to move a certain distance downstream than upstream. the ratio of the boat's speed in still water and that of the current is.
Ratio of speed of boat in downstream and speed of stream is 7:3, if speed of current is 9 km/hr, then find distance travelled (in km) upstream in 6 hours.