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 answer: A) 35.55 km/hr B) 36 km/hr C) 71.11 km/hr D) 71 km/hr E) 72 km/hr
Total time taken = [160/64 + 160/80 ] hrs. 9/2 hrs   Average speed = [ 320 x 2/9] km/hr = 71.11km/hr   Answer is 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?