A man on tour travels first 160 km at 64 km/he and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is? Options.
A) 71.11 km/hr	B) 66.11 km/hr	C) 78.11 km/hr	D) 81.11 km/hr	E) 54.11 km/hr
A   71.11 km/hr   Total time taken = (160/64 + 160/8) = 9/2 hrs.   71.11 km/hrverage speed = 320 * 2/9 = 71.11 km/hr.
<result>A</result>
A man on tour travels first 160 km at 64 km/he and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is?