A car travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. What is the average speed for the first 320 km of the tour? Choose the most appropriate option:	A) 71.11	B) 71.12	C) 71.1	D) 71.17	E) 71.13
Car travels first 160 km at 64 km/hr   Time taken to travel first 160 km = distancespeed=16064   Car travels next160 km at 80 km/hr   Time taken to travel next 160 km = distancespeed=16080Total distance traveled = 160+160=2×160Total time taken = 16064+1608071.11verage speed = Total distance traveledTotal time taken=2×16016064+16080=2164+180=2×64×8080+64=2×64×80144=2×8×8018=6409=71.11 km/hr   71.11nswer:71.11
<result>A</result>
A car travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. What is the average speed for the first 320 km of the tour?