A fish rising up vertically toward the surface of water with speed 3ms−1 observes a bird diving down vertically towards it with speed 9ms−1. The actual velocity of bird is :
4.5ms−1
5.4ms−1
3.0ms−1
3.4ms−1
A
5.4ms−1
B
4.5ms−1
C
3.0ms−1
D
3.4ms−1
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