self Maths Puzzle Numerical Ability Probability

A tank is filled in 5 hours by three pipes A,B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?
a) 35 hours
b) 25 hours
c) 20 Hours
d) Cannot be determined
e) None of these

Read Solution (Total 1)

a)35 hours

Let pipe A alone takes to fill the tank = x hours.

Then, pipes B take twice fast as A = x/2
And pipes C take twice fast as B = x/4
Therefore, Tank filled in 5 hours by A,B,C pipes => 1/x + 2/x + 4/x = 1/5
==> 7/x = 1/5
==> x = 5*7
x= 35 hours
x = 35 hrs.
12 years agoHelpfull: Yes(9) No(1)

self Other Question

A alone can do a work in 12 days. A and B together finished work and got rs.54 and rs.18 respectively. In how many days was the work finished?
a) 12
b) 14
c) 9
d) 10
e) 8 From 3 men and 4 women, three persons are to be selected in such a way that at least one women is selected. In how many different ways can they be selected?
a) 60
b) 42
c) 21
d) 36
e) None of these