A metal sphere cools from 64 °C to 55 °C...

A metal sphere cools from 64 °C to 55 °C in 10 minutes and to 42 °C in the next 10 minutes. The ratio of fall of temperature of first 10 minutes to next ten minutes is

A

`13/9`

B

`7/6`

C

`9/13`

D

`4/7`

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