A train is moving at 6/7 of its usual speed. The train is 10 minutes too late. What is the usual time (in hours) for the train to complete the journey?  Choose the correct option:	A) 0.5	B) 1	C) 1.5	D) 2	E) 2.5

Rationale: "new time = d / ( 6 v / 7 ) = 7 / 6 * usual time 10 minutes represents 1 / 6 of the usual time . the usual time is 1 hour . the answer is b ."
Answer: B