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+//Train B overtakes train A
+//refer fig.12.12
+//speed of A
+v1=7.5  //m/sec
+//speed of B
+v2=15  //m/sec
+//motion of train A
+//using equation of motion
+t1=7.5/0.15  //sec
+//distance travelled in time t
+//s=7.5*t-187.5
+//Motion of train B
+//using equation of motion
+t2=15/0.3  //sec
+//distance travelled t seconds after train A started
+//s=15*t-975
+//solving
+t=(975-187.5)/(15-7.5)  //sec
+s=15*t-975  //m
+printf("\nTrain B overtakes train A %.2d sec\ns=%.2d m",t,s)