35. Water is flowing at 4km/hr through a cylindrical pipe of internal
diameter 16cm into a tank of dimensions 22m x 20m x 16m. How
long will it take to fill the empty tank.
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since dimensions of tank are given as 22X20x16 without any units they are assumed to be in metres
tank capacity =22*20*16 =7040cubic metres =7040 *10^6 cc =7040*10^3 litres
4km/hr =4000 *100/3600=4000/36 =1000/9 cms/sec
area of pipe =3.142*16*16/4 =804.352/4 sq cm
volume pumped per second =804.352/4*1000/9 =89372.44/4 cc= 89.37244/4 litre/second
Time taken to fill the tank =7040000/{89.37244/4] =4*78771.49/ seconds
=4*78771.49/60minutes=4*1312.86min=4*1312.86/60hrshrs=4*21.881hrs=87.52hrs
0.1 hr =6min
for 0.52hr=6 *.52/0.1=3.12/0.1=31.2 mins
0.1 min =6secs for 0.2 mins =12seconds
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