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139.A man travels one third of its journey by foot at speed of 3km/h,next one third by bus at speed of 30km/h and rest journey by train at speed of 60 km/h find average speed of man |
| Answer» 139.A man travels one third of its journey by foot at speed of 3km/h,next one third by bus at speed of 30km/h and rest journey by train at speed of 60 km/h find average speed of man | |