question_answer

A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is?

A) 35.55 km/hr                  

B) 36 km/hr

C) 71.11 km/hr                  

D) 71 km/hr

Correct Answer: C

Solution :

Total time taken \[=2.5+2\] \[=4.5\,\,hours\] Now, the required average speed \[=\frac{320}{4.5}\] \[=71.11\,\,km/hr\]