A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is:
Choose the correct choice from the following answers:  A) 31.11 km/hr  B) 35.55 km/hr  C) 71.11 km/hr  D) 36 km/hr  E) 71 km/hr
Total time taken = 160/64 + 160/80 = 9/2 hours   --&gt; Average speed = 320 x 2/9 = 71.11 km/hr.   Answer : 71.11 km/hr.
<result>C</result>
A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is: