Question

What is the average speed of a car? I. Average speed of the car is double the average speed of a truck whereas the average speed of a bus is 30 km/hr. II. Average speed of the truck is thrice the average speed of the bus whose speed is 30 km/hr.

• A. If the data in statement I alone are sufficient to answer the question, but the data in statement II alone are not sufficient to answer the question.
• B. If the data in statement II alone are sufficient to answer the question, but the data in statement I alone are not sufficient to answer the question.
• C. If the data in both statements I and II together are not sufficient to answer the question.
• D. If data in both statements I and II are needed to answer the question

Answer 1

Answer:

D. If data in both statements I and II are needed to answer the question

The answer cannot be obtained from any statement alone. Using both statements together, we get: From statement II, we can find that the speed of the truck is 90 km/hr and then by using statement I, we can say that the average speed of the car is 180 km/hr.