A man on tour travels first 160 km at 72 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 choices.
A) 31.11 km/hr	B) 35.55 km/hr	C) 71.11 km/hr	D) 36 km/hr	E) 75.8 km/hr
Total time taken = 160/72 + 160/80 = 3040/720 = 38/9 hours   --&gt; Average speed = 320 x 9/38 = 75.8 km/hr.   Answer : 75.8 km/hr.
<result>E</result>
A man on tour travels first 160 km at 72 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is: