One litre of water at 30^°C is mixed with one litre of water at 50^°C. The temperature of the mixture will be

a. 80^°C

b. more than 50^°C but less than 80^°C

c. 20^°C

d. between 30^°C and 50^°C

One litre of water at 30^°C is mixed with one litre of water at 50^°C. The temperature of the mixture will be between 30^°C and 50^°C. This is because there is transferred of heat from an object with high temperature to an object having a low temperature. So, heat will flow from one litre of water at 50°C to one litre of water at 30^°C. So, the temperature of the mixture will be between 30^°C and 50^°C.