A car covers first half of certain journey with speed of 50 km/h and second half journey with speed of 40 km/h. If it takes 9 hours to cover total distance. What is the distance covered in whole journey?

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A car covers first half of certain journey with speed of 50 km/h and second half journey with speed of 40 km/h. If it takes 9 hours to cover total distance. What is the distance covered in whole journey?