An engine is approaching a hill at constant speed. When it is at distance of 0.9  km, it blows a ...

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Counter-Strike: Source
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Counter-Strike: Source (2004)
Duration: 6:09
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An engine is approaching a hill at constant speed. When it is at distance of 0.9  km, it blows a whistle whose echo is heard by the driver after 5  s. If the speed of sound is 340 m / s, calculate the speed of the engine.
a. 10  m / s
b. 20  m / s
c. 30  m / s
d. 40  m / s
e. None of these

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