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A Man Drove His Car Northward ,then Turned Left And Drove 10km And Again Turned Left And Drove 20km.He Found Himself 10km West Of His Starting Point.How Far Did He Drive Northward Initially? - Math Discussion

A man drove his car northward ,then turned left and drove 10km and again turned left and drove 20km.He found himself 10km west of his starting point.How far did he drive northward initially?