A man on tour travels first 150 km at 50 km/hr and the next 140 km at 70 km/hr. Find the average speed for first 290 km of tour. Choose the correct choice from the following answers.
A) 54.11 km/hr
B) 56.11 km/hr
C) 58 km/hr
D) 60.11 km/hr
E) None of these
Explanation:   We know Time = Distance/speed   So total time taken =   (150/50+140/70)= 
<gadget id="calculator">(150/50+140/70)</gadget>
<output>5</output>
5hours   Time taken for 290 Km= 290/5= 
<gadget id="calculator">290/5</gadget>
<output>58</output>
58km/hr   Option 58 km/hr
<result>C</result>
A man on tour travels first 150 km at 50 km/hr and the next 140 km at 70 km/hr. Find the average speed for first 290 km of tour.