Answer
A
Work Step by Step
$\dot{m}_1+\dot{m}_2=\dot{m}_3$
$\dot{m}_1=5\ kg/min,\ \dot{m}_2=2\ kg/min$
$\dot{m}_3=7\ kg/min$
$\dot{m}_1c_pT_1+\dot{m}_2c_pT_2=\dot{m}_3c_pT_3$
$T_1=283\ K,\ T_2=333\ K$
$T_3=297.29\ K=24.29°C$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.