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What is the concept of how many times faster a math problem is? For example, A's speed is 20, B's speed is twice as fast as his, and B's speed is 60 or 40? Urgent! ! !
A speed is 20, B speed is twice as fast as him, and B speed is three times as fast as a car.
Then B's car is: 20x3=60.
If the speed of car B is twice that of car A,
The second car is: 2x20=40.
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