GMAT
Before the opening of the Erie Canal in 1825, moving a ton of wheat from Buffalo to New York City took three weeks and cost 0; on the canal the move took less than eight days and cost less than $6.
When a ton of wheat was being moved from Buffalo to New York City before the opening of the Erie Canal in 1825, it took three weeks and cost 0, but when the canal was used, it took less than eight days and cost less than $6.
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