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+//chapter 16 Ex 2
+clc;
+clear;
+close;
+//let pipes be A, B and C
+t1=10; t2=12; //time taken by A and B to fill tank individually
+t3=-20; //negative sign since time taken is to empty the tank
+A1hour=1/t1; B1hour=1/t2; //part filled by A and B in 1 hour each
+C1hour=1/t3;              //part emptied by C in 1 hour
+ABC1hour=A1hour+B1hour+C1hour;    //part filled by all 3 pipes in 1 hour
+mprintf("Thus the time taken by all pipes together to fill the tank is %.1f hours",1/ABC1hour);