On a given day a boat ferried 1,500 passengers across the river in 12 hr. How many round trips did it make?

I. The boat can carry 200 passengers at any time.

II. It takes 40 min each way and 20 min of waiting time at each terminal.

A

The question can be answered by one of the statements alone and not by the other.

B

The question can be answered by using either statement alone.

C

The question can be answered by using both the statements together, but cannot be answered by using either statement alone.

D

The question cannot be answered even by using both statements together.