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A mathematical problem about pursuit A snail and an earthworm walk on a square ABCD with a side length of 30. The snail moves forward at the speed of 8cm per minute at point a, and the earthworm moves forward at the speed of 18cm per minute at point B. which segment do they meet for the first time? AB, BC, CD, ad which segment? How to solve? For the specific process, it's better to solve the equation. Thank you
The earthworm was 30 × 3 = 90cm behind the snail
The first time they meet, it takes 90 / (18-8) = 9 minutes
At this time, the snail walked 8 * 9 = 72cm,
72 / 30 = 2, 12,
So the snail is on the CD,
That's when they first met on a CD
For an eight digit number, the number on ten thousand is three. For ten thousand level, the two adjacent numbers from high to low are 9, 10 and 10 respectively. The sum of any three numbers on each level is 15. This number is ()
900035555
A math problem, I hope to have an answer tonight. Nine out of ten girls are equal to the number of boys, and the number of boys is equal to ()
Nine tenths of the female population is equivalent to the male population, and the male population is equivalent to 90% of the female population
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