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A Man Drove His Car Northward, Then Turned Left And Drove 10 Km And Again Turned Left And Drove 20km. He Found Himself 10 Km 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 10 km and again turned left and drove 20km. he found himself 10 km west of his starting point . how far did he drive northward initially