Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the top speed of the model 1.8 20v t?

### Inputs:
table_name: table, columns: ['model', 'cylinders/ valves', 'displacement cc', 'max. power kW (PS) at rpm', 'max. torque (Nm) at rpm', 'engine code', 'top speed (km/h)', 'production period']

### Response:
SELECT SUM top speed (km/h) FROM table WHERE model = 1.8 20v t