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+//speed of driven shaft
+//a-If the intermediate gears are on different shaft
+TA=25
+TD=100
+NA=160 //rpm
+aND=TA*NA/TD //rpm
+//b-If the intermediate gears are on the same shaft
+bND=(75*25*160)/(50*100) //rpm
+printf("\ncase a\nND=%.2f rpm\ncase b\nND=%.2f rpm",aND,bND)