Final answer:
The train is approximately 2 times more efficient than the car for a trip of 1000 km.
Step-by-step explanation:
The energy expenditure value of traveling by car is 3.6 MJ/passenger-kilometer, and the value for traveling by train is 1.1 MJ/passenger-kilometer.
To determine which mode of transportation is more efficient for 1 person making a trip of 1000 km, we need to compare the energy used by each mode.
The energy used by the car would be 3.6 MJ/passenger-kilometer * 1000 km = 3600 MJ.
The energy used by the train would be 1.1 MJ/passenger-kilometer * 1000 km = 1100 MJ.
Therefore, the train is approximately 2 times more efficient than the car.