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Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

A train traveling miles per hour for hour covers the same distance as a train traveling miles per hour for how many hours?

Correct!

Explanation

When the speed of a train in miles per hour is multiplied by the travel time in hours, the distance traveled by the train is obtained. The distance that the first train travels is miles per hour times hour, which is miles. Using the variable for the travel time, in hours, of the second train, the distance that the second train travels is miles per hour times hours, which is 30 times x miles. Since the two trains travel the same distance, 60 = 30 times x , which gives x = 2 hours, the travel time of the second train.