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?
70.11 km/hr
77.11 km/hr
71.11 km/hr
74.44 km/hr
Explanation:
Average Speed =(2×64×80)/(64+80)
=(2×64×80)/144=(2×32×40)/36
=(2×32×10)/9=(64×10)/9=71.11 kmph
Average Speed =(2×64×80)/(64+80)
=(2×64×80)/144=(2×32×40)/36
=(2×32×10)/9=(64×10)/9=71.11 kmph