Wednesday, July 10, 2013

Two pipes can filIa tank in 10 hrs and 20 hrs, respectively. How long will they take to fill up the tank, if they are used together?

1/10+1/20 =1/t 
2/20+1/20 = 1/t 
3/20 = 1/t 
t=20/3 = 6 hrs 40 min 

:)
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