A truck covers a distance of 550 metres in 1 minute whereas a bus covers a distance of 33 kms in 45 minutes. The ratio of their speeds is :

Ration of speed = \(\left ( \frac{550}{60} \times \frac{18}{5} \right ) : \left ( \frac{33}{45} \times 60 \right )\)

= 33 : 44

= 3 : 4