A track covers a distance of 550 metres in 1 minute whereas a bus covers a distance of 33 kms in 45 minute. The ratio of their speeds is:  Choose the correct choice from the following:
A) 4 : 3  B) 3 : 5  C) 3 : 4  D) 50 : 3  E) none

Rationale: solution : speed of track = 550 per minute . speed of bus = 33 kms / 45 = 33000 / 45 = 733.33 m / minute ratio of their speeds = 550 / 733.33 = 3 : 4 . answer : option c
Answer: C