4 x 108ms-1
2.25 x 108ms-1
49 x 108ms-1
2.25 x 102ms-1
4.33 x 108ms-1
Correct answer is B
Air to water = speed in airspeed in water
43 = 3×108V
4V = 3(3 x 108)
V = 3(3×108)4
V = 2.25 x 108ms-1
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