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diff --git a/2780/CH1/EX1.11/Ex1_11.sce b/2780/CH1/EX1.11/Ex1_11.sce
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+clc
+//to calculate speed
+deltat0=1440 //proper time interval measured by an observer moving with the clock (min)
+deltat=1444 //time interval measured by a stationary observer (min)
+c=3*10^8 //light speed (m/s)
+v=c*sqrt(1-(deltat0/deltat)^2)
+disp(" moving clock appears to lose 4min in 24 hours from the stationary observer is v="+string(v)+"m/s")
+//answer is given wrong in the book =2.32*10^7 m/s