A) 10 mins 42 sees
B) 12 mins 35 sees
C) 15 mins 42 sees
D) 10 mins 35 sees
Correct Answer: C
Solution :
Distance covered in one round is \[2\times 3.14\times 50=314m\] \[\therefore \] Distance covered in 10 rounds = 3140 m Speed \[=12\text{ }km/hr\] \[=12\times \frac{5}{18}m/\sec =\frac{10}{3}m/\sec \] Now, Time taken \[=\frac{Distance\text{ }covered}{~Speed}\] \[=\frac{3140\times 3}{10}=942\sec s=15\text{mins}\,\,42\text{secs}\]
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