PLC Programming - Ladder Logic

Consider a chemical tank for which there are three variables to be monitored are, (a) level (b) pressure (c) temperature. The alarm will sound if the liquid level is high and the temperature is high. Another condition for alarm is a combination of high liquid level with low temperature and high pressure. Draw the truth table and logical circuit such that an alarm is sounded when the above combinations of conditions occur between the variable. Draw a ladder logic for a machine which dispenses either coffee or tea upon inserting coins. Let A, B, and C represent coffee, tea and coin input, respectively. The condition for output is such that either coffee or tea will be dispensed on inserting the coin and pressing the appropriate button. If on the other hand, you press both coffee and tea buttons after inserting the coin, the machine should dispense coffee only