A train traveled the first d miles of its journey it an average speed of 60 miles per hour, the next d miles of its journey at an average speed of y miles per hour, and the final d miles of its journey at an average speed of 160 miles per hour. If the train’s average speed over the total distance was 94 miles per hour, what is the value of y?
Choose the correct choice:
A) 98
B) 84
C) 90
D) 120
E) 135
98verage speed=Total distance traveled /Total time taken   3d/d/60+d/y+d/160=94   Solving for d and y,   15y=11y+480   5y=480   y=98   98nswer 98
<result>A</result>
A train traveled the first d miles of its journey it an average speed of 60 miles per hour, the next d miles of its journey at an average speed of y miles per hour, and the final d miles of its journey at an average speed of 160 miles per hour. If the train’s average speed over the total distance was 94 miles per hour, what is the value of y?