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+//chapter 16 Ex 7
+clc;
+clear;
+close;
+//let pipes be A B and leak be C
+t1=36; t2=45; //time taken by A and B to fill tank individually
+t3=30;        //time taken by leak to empty the tank
+A1min=1/t1; B1min=1/t2; //part filled by A and B in 1 min each individually
+C1min=-1/t3; //part emptied by leak
+AB1min=A1min+B1min;     //part filled by A and B in 1 min each together
+AB7min=7*AB1min;
+remainingPart=1-AB7min;
+ABC1min=A1min+B1min+C1min;           //part filled by all 3 pipes in 1 min
+totalTime=(1/ABC1min)*remainingPart+7;
+
+mprintf("Thus total time taken to fill the tank is %.0f min",totalTime);