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A train approaching a hill with a speed ...

A train approaching a hill with a speed of 40 km/h sounds a whistle of frequency 580 Hz when it is at a distance of 1 km from a hill. Wind with a speed of 40 km/h is blowing in the direction of motion of the train. The velocity of sound in air 1200 km/hr. The distance from the hill at which the echo from the hill is heard by the driver and its frequency is

A

`30/29` km, 600 Hz

B

`29/31` km, 618.6 Hz

C

`30/29` km, 500 Hz

D

`29/30` km, 599.3 Hz

Text Solution

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The correct Answer is:
C
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