Janexi covered a distance of 340 miles between city A and city B taking a total of 5 hours. If part of the distance was covered at 60 miles per hour speed and the balance at 80 miles per hour speed, how many hours did she travel at 60 miles per hour?
Choose the most appropriate option:
A) 1 hour 45 minutes B) 2 hours C) 2 hours 30 minutes D) 3 hours E) None of these
Janexi covered a distance of 340 miles between city A and city B taking a total of 5 hours. time taken at 60:time taken at 80::(greater speed-average speed):(average speed-lower speed)   average speed is   340/5= 
<gadget id="calculator">  340/5</gadget>
<output>68</output>
68   That gives the answer 3:2=3 hours
<result>D</result>
Janexi covered a distance of 340 miles between city A and city B taking a total of 5 hours. If part of the distance was covered at 60 miles per hour speed and the balance at 80 miles per hour speed, how many hours did she travel at 60 miles per hour?