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An engine is going away from a hill with a constant speed. When it is at a distance of 900 m, it blows a whistle. The echo of the same is heard by the driver after 6 sec. If speed of sound in air is $$330\ \text{m/s}$$, the speed of engine is
In 6 s the sound travels 900 m to the hill and then back to the engine, which has moved a further 6v away. So $$330 \times 6 = 900 + 900 + 6v$$, i.e. $$1980 = 1800 + 6v$$, giving $$v = 30\ \text{m/s}$$.
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