A man on tour travels first 120 km at 60 km/hr and the next 160 km at 80 km/hr. Find the average speed for first 280 km of tour.	Select: A) 70.00 km/hr B) 71.11 km/hr C) 72.11 km/hr D) 73.11 km/hr E) None of these
Explanation:   We know Time = Distance/speed   So total time taken =   (120/60+160/80)= 
<gadget id="calculator">(120/60+160/80)</gadget>
<output>4</output>
4hours   Time taken for 280 Km= 280/4= 
<gadget id="calculator">280/4</gadget>
<output>70</output>
70.km/hr   Option 70.00 km/hr
<result>A</result>
A man on tour travels first 120 km at 60 km/hr and the next 160 km at 80 km/hr. Find the average speed for first 280 km of tour.