CREW AND BOAT PROBLEM

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A crew can row a certain course up the stream in 84 mins;they can row down the same course down stream in 9 mins less than they can row in still water.How long wud they take to row down with the stream?EXPLAIN!
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A crew can row a certain course up the stream in 84 mins;they can row down the same course down stream in 9 mins less than they can row in still water.How long wud they take to row down with the stream?

EXPLAIN!





a) 45 or 23 mins
b) 63 or 12 mins
c) 60 mins
d) 19 mins
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