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A rod of 40 cm in length and temperature...

A rod of 40 cm in length and temperature difference of `80^(@)C` at its two ends. Another rod B of length 60cm and of temperature difference `90^(@)C`, having the same area of cross-section. If the rate of flow of heat is the same, then the ratio of their thermal conductivities will be

A

`3 : 4`

B

`4 : 3`

C

`1 : 2`

D

`2 : 1`

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The correct Answer is:
A
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