Mathematics · Time, Speed and Distance

Baman started from his home and first travelled by car at 120 km/h for 6 minutes. After that, he walked for x km at a speed of 30 km/h. He then continued his journey by train and finally by bus to reach his office. The total travel time was 3 hours. The speed of the bus is 40 km/h less than the speed of the car, while the speed of the train is 70 km/h less than the speed of the car. If the distance covered by train and bus is 80 km and 40 km respectively, find the value of x.