Patrick was running in a 500 m race. He ran 300 m in 50 seconds and walked the remaining distance. If he took 150 seconds in total to finish the race, what was his average speed? Answer from school: speed for 300 m = 300 ÷ 50 = 6 m/s speed for remaining = 500-300=200 200 ÷ 100 = 2 m/s therefore, (6+2) ÷ 2 = 4 m/s (补习学校答案是4 m/s) 可是,我老公就是认为不对 他说应该用 500 ÷ 150 = 3.33 m/s 到底哪个对呢?我也迷糊晕了 |