An engine is approaching a hill at constant speed. When it is at distance of \( 0.9 \mathrm{~km}...

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An engine is approaching a hill at constant speed. When it is at distance of \( 0.9 \mathrm{~km} \), it
D blows a whistle whose echo is heard by the driver after \( 5 \mathrm{~s} \). If the speed of sound is 340 \( -\mathrm{m} / \mathrm{s} \), calculate the speed of the engine.
a. \( 10 \mathrm{~m} / \mathrm{s} \)
b. \( 20 \mathrm{~m} / \mathrm{s} \)
c. \( 30 \mathrm{~m} / \mathrm{s} \)
d. \( 40 \mathrm{~m} / \mathrm{s} \)
e. None of these
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