The two vehicles of Party A and Party B run from two places of 600km at the same time. Car a runs 45km per hour, car B runs 40km per hour, and car a runs for two hours first B car just leave. B car and a car meet after a few hours

The two vehicles of Party A and Party B run from two places of 600km at the same time. Car a runs 45km per hour, car B runs 40km per hour, and car a runs for two hours first B car just leave. B car and a car meet after a few hours

(600-45x2) / (40 + 45) = 510 / 85 = 6 hours