A) 15.4 seconds
B) 154 seconds
C) 1540 seconds
D) 15400 seconds
Correct Answer: B
Solution :
Required time \[=\frac{\pi \,\,{{(70)}^{2}}\times 50}{5\times 1000}\] \[=\frac{22\times 4900\times 50}{7\times 5\times 1000}=154\,\,\sec \]
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