1.A stream flowing at 35 cubic meters per minute has a temperature of 18 degrees C. A discharge from a power plant cooling tower has a temperature of 81 degrees C and flows into the stream at a rate of 3 cubic meters per minute. What is the temperature in the stream downstream of the cooling tower discharge?
2.A particle enters a 20 meter long rectangular settling tank an travels with the flow at a horizontal velocity of 0.09 meters per second. If the tank is 2 meters deep and the particle enters the tank at the surface of the water, what is the longest amount of time that the particle can take to settle, if it is to be removed?