40 men can build a wall 200 m. long in 12 days working 8 hrs. a day. The number of days 30 men will take to build a similar wall 300 m. long working 6 hrs. a day will be -
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40 men can build a wall 200 m. long in 12 days working 8 hrs. a day. The number of days 30 men will take to build a similar wall 300 m. long working 6 hrs. a day will be -