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JEE Main Physics Class 11 Waves Part 1 Questions

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Question : 73

Total: 100

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 :

[Online April 9, 2013]

32 m/s
27.5 m/s
60 m/s
30 m/s

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