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How to solve this question? The answer for A is 40kmh-1

How to solve this question? The answer for A is 40kmh-1-example-1
User Jmend
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Wish it'll help
If you didn't get it let me know and I'll explain it with more details (even though this one was clear enough)
How to solve this question? The answer for A is 40kmh-1-example-1
User Miguel Ruivo
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