Discussion
A test cycle covers \( 11 \) km in \( 1180 \) s. Its average speed is
Answer: A
Correct answer: 33.6 km/h
Convert the time to hours before dividing:
\[ \frac{11}{1180/3600} = \frac{11 \times 3600}{1180} = 33.6\ \mathrm{km/h} \]
An average of about 34 km/h characterises a mixed urban and extra-urban cycle, and the figure matters because emissions are strongly load dependent. A cycle whose average speed is far below real driving will understate the emissions a vehicle produces in service - the criticism that led to the newer test procedures.
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