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A circular disc of area 0.64 Pi m^2 roll...

A circular disc of area `0.64 Pi m^2` rolls down a length of 1.408 km. The number of revolutions it make is:
एक वृत्ताकार डिस्क, जिसका क्षेत्रफल `0.64 P` वर्ग मीटर है, 1.408 किमी की लंबाई तक घूमती है | इसके द्वारा लगाए गए चक्करों की संख्या है : (Take `Pi=22/7)`

A

280

B

360

C

140

D

180

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