Answer :

Info. from the question:

Speed of sound = 1500 m⁄s

Time taken for to and fro round = 4 s

The time given in the question is of complete round of sound wave that is sending and receiving it back, so if we take distance between ship and rock = d then,

the total distance travelled = 2d

2d = speed× time

2d = 1500× 4

2d = 6000

d = 3000 m.[T1]

Hence, the distance between rock and ship = 3000 m.

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<span lang="EN-USKerala Board Physics Part I