An engine approaches a hill with a constant speed. When it is at a distant of 0.9 km

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An engine approaches a hill with a constant speed. When it is at a distant of 0.9 km, it blows a whistle whose echo is heard by the driver after 5 seconds. If the speed of sound in air is 330 m/s, then the speed of the engine is:
15
Sep
An engine approaches a hill with a constant speed. When it is at a distant of 0.9 km, it blows a whistle whose echo is heard by the driver after 5 seconds. If the speed of sound in air is 330 m/s, then the speed of the engine is: An engine approaches a hill with [...]
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