1.

Two pipes a and b can fill a tank independently in 40 and 60 minutes. it both the pipes are opened together, how much time will they take to fill tha tank?

Answer»

Time TAKEN by PIPE A to fill=2/3 hr
time taken by pipe B to fill=1 hr
work done by both A &B in 1 hr
=3/2+1=5/2
time they TAKE to fill tha tank=2/5 hrs



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