The ends of metal road are maintained a...

The ends of metal road are maintained at temperature `120°C` and `150°C`. The rate of heat flow in the road is to be found to be `10 J/s`. If an identical rod is connected in parallel with this rod and ends temperature are maintained at `220°C` and `250°C`, then net rate of flow of heat will be

`10 J/s`

`20` J/s

`30` J/s

`15` J/s

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