Anil completes the 72km journey between bristol and cardiff in 48 minutes. he then drives 69km from cardiff to swansea at an average speed of 60km/h. work out anil's average speed (in km/h) for his total journey from bristol to swansea

The average speed is calculated by dividing the total distance covered over the total time spent to cover that certain distance. From the given,

              total distance = distance from Bristol to Cardiff + distance from Cardiff to Swansea

Substituting,
             total distance = 72 km + 69 km = 141 km

Calculate first for the time spent to travel from Cardiff to Swansea.
          time = 69 km / (60 km/h) = 1.15 h

Calculating for the total time,
             time = (48 minutes / 60 minutes) + 1.15 h
                time = 1.95 h

Substituting this to the equation for average speed,
           average speed = 141 km / 1.95 h
                     = 72.3 km/h

72.3 km/h

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