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A Carnot engine operating between temperatures T1 and T2 has efficiency 1/6. When T2 is lowered by 62K, its efficiency increases to 1/3. Then T1 and T2 are, respectively

(a) 372K and 310K 

(b) 372K and 330K

(c) 330K and 268K 

(d) 310K and 248K

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(a) : The efficiency of Carnot engine,

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