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A student is jogging on a straight path ...

A student is jogging on a straight path with the speed 5.4 km per hour. Perpendicular to the path is kept a pipe with its opening 8m from the road (see figure). Diameter of the pipe is 0.45 m . At the other end of the pipe is a speaker emitting sound of 1280 Hx to wards the opening of the pipes. As the student passes in front of the pipe, she hears the speaker for T seconds. T is in the range (Take speed of sound, 320 m/s)

A

`6-12`

B

`12-18`

C

`3-6`

D

`18-22`

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