Consider two hot bodies B(1) and B(2) wh...

Consider two hot bodies `B_(1)` and `B_(2)` which have temperature `100^(@)"C"` and `80^(@)"C"` respectively at t = 0. The temperature of surroundings is `40^(@)" C"`. The ratio of the respective rates of cooling `R_(1)` and `R_(2)` of these two bodies at` t = 0` will be

`R_1:R_2=3:2`

`R_1:R_2=5:4`

`R_1:R_2=2:3`

`R_1:R_2=4:5`

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