A train is moving at 6/7 of its usual speed. The train is 15 minutes too late. What is the usual time (in hours) for the train to complete the journey?
Choose the correct answer:
A) 1  B) 1.5  C) 2  D) 2.5  E) 3
new time = d / (6v/7) = 7/6 * usual time   15 minutes represents 1/6 of the usual time.   The usual time is 1.5 hours.   The answer is 1.5.
<result>B</result>
A train is moving at 6/7 of its usual speed. The train is 15 minutes too late. What is the usual time (in hours) for the train to complete the journey?