Question: Choose 1 ; if the question can be answered by using one of the statements alone, but cannot be answered using the other statement alone.Choose 2 ; if the question can be answered by using either statement alone.Choose 3 ; if the question can be answered by using both statements together, but cannot be answered using either statement alone.Choose 4 ; if the question cannot be answered even by using both statements together.
On a given day a boat ferried 1500 passengers across the river in twelve hours. How many round trips did it make?
The boat can carry two hundred passengers at any time.
It takes 40 minutes each way and 20 minutes of waiting time at each terminal.
Statement A only gives the maximum capacity of the boat.
∴ The number of trips cannot be calculated.
∴ Statement A alone is not sufficient to answer the question.
∴ Statement B alone is sufficient to answer the question.
Hence, option (a).