A ship steams towards a hill in the sea ...

A ship steams towards a hill in the sea and sounds its siren and the echo is heard after 6 s. The siren is sounded again 3 minutes later after the first sounding and the echo is heard after 4 s. If the velocity of the ship is 6.87 kmph, calculate the velocity of sound in air.

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The correct Answer is:

`341.6 ms^(-1)`

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