Consider the question. A passenger train transports passengers between two stations located in two separate cities. On a particular day, the train carried 100 passengers from one station to the other one way, and on the return trip carried 60 passengers. If the train made three more round trips that day, taking the same number of people as the first trip in each trip, calculate the total number of passengers transported between both stations?
 What is the step-by-step reasoning process to arrive at the answer: 640?
The total number of people transported in the first trip is 100 one way + 60 on the return trip = 160 people. If the train made three more round trips that day carrying the same number of passengers in each trip as the first, it carried a total of 3 * 160 = 480 in all three round trips. In total, the train carried 160 + 480 = 640 people over all its trips that day.