A bus moves with a speed of 36 kilometres per hour for 20 minutes and then with a speed of 54 kilometres per hour for the next 20 minutes. The total distance covered by the bus is:

Convert the time to hours, so 20 minutes becomes one-third of an hour. The distance covered in the first part is 36 multiplied by one-third, which equals 12 kilometres. The distance covered in the second part is 54 multiplied by one-third, which equals 18 kilometres. Adding these two distances gives the total distance of 30 kilometres.

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