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An engine approaches a hill with a const...

An engine approaches a hill with a constant speed. When it is at a distance 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 :

A

32 m/s

B

27.5 m/s

C

60 m/s

D

30 m/s

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