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Xiaoming's journey from home to school is 540 meters. It takes him 9 minutes to go to school, and it takes him 3 minutes less to go home than to go to school? It's wrong. 540 △ 9 = 60m, 540 △ 6 = 90m (90 + 60) △ 2 = 75m. This answer is wrong. The great Xia can help me see where it is wrong. The correct answer is 540 × 2 △ 9 + 6 = 72m
The average speed of the round trip can not be divided by two times of speed. The average speed is the total distance and the total time
The total distance is 540 × 2 = 1080 (m)
Time to go home: 9-3 = 6 (minutes)
The total time is 6 + 9 = 15 (minutes)
The average speed of round trip is 1080 △ 15 = 72 (M / min)
Xiaoming's journey from home to school is 540 meters. It takes 9 minutes for Xiaoming to go to school, and it takes 2 minutes less to go home than to go to school. So how many meters does Xiaoming walk every minute for a round trip?
540 times 2 divided by (9 + 7)
Xiao Ming's journey from home to school is 540 meters. It takes him 10 minutes to go to school, and it takes him 20 minutes more to go home than when he went to school. How many meters does Xiao Ming walk every minute on average?
540×2÷[10+（10+20）]
=1080÷40
=27m
A: Xiao Ming walks an average of 27 meters per minute
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