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A hollow cylinder has height 90 cm and t...

A hollow cylinder has height 90 cm and the outer curved surface area is 11880 `cm^2`. It can hold 55440 `cm^3` of air inside it. What is the thickness (in cm) of this cylinder?
एक खाली बेलन की ऊँचाई 90 सेमी तथा बाह्य बक्र पृष्ठीय क्षेत्रफल 11880 `सेमी.^2` है। 55440 `सेमी.^3` वायु अपने अंदर रख सकता है। बेलन की मोटाई (सेमी. में) क्या है?

A

A)10.5

B

B)14

C

C)7

D

D)3.5

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