Kitchen Table Math
Kitchen Table Math is a blog/wiki about doing math with your children.
One thing that caught my eye was a Russian textbook example: "Two cars leave simultaneously at 9 a.m. heading toward one another from different cities that are 210 km apart. The average speed of one car is 50 km/h while the other car averages 70 km/h. Come up with an appropriate question and answer it."
One thing that caught my eye was a Russian textbook example: "Two cars leave simultaneously at 9 a.m. heading toward one another from different cities that are 210 km apart. The average speed of one car is 50 km/h while the other car averages 70 km/h. Come up with an appropriate question and answer it."
posted by NerdDad at
10:05 AM
3 Comments:
At what time will the two cars pass each other?
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10:37 (and 30 seconds)
By
Sara Edwards, at 2:06 PM
The cars are moving toward each other at 120 km/h. They will cover 210 km in 1.75 hours. Thus, they will met at 10:45.
By
NerdDad, at 10:44 AM
Doh!
By
Sara Edwards, at 10:02 AM
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