A walks 5 km/h, B runs 10 km/h. B catches A with 3 km head start in?
Q1. A walks 5 km/h, B runs 10 km/h. B catches A with 3 km head start in?
Answer: 0.6 h
Explanation: Relative speed 5 km/h closes 3 km gap in 0.6 hours. Apply the same method to similar ISSB quantitative items.