A car travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. What is the average speed for the first 320 km of the tour?
Q1. A car travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. What is the average speed for the first 320 km of the tour?
Answer: 71.11 km/hr
Explanation: Total time = 160/64 + 160/80 = 2.5 + 2 = 4.5 hrs; average speed = 320/4.5 ≈ 71.11 km/hr.