Infosys Company Numerical Ability Time and Work

There are two taps, which are used to fill the tank and one tap to empty the tank. First tap fill the tank in 10 min., while the second takes quarter of an hour to fill the tank if both are operated independently.Third tap is capable of emptying the tank in seven and a half minutes. If all the taps are opened simultaneously how long (if ever) will it take for the tank to get filled completely?

Read Solution (Total 5)

Pipe A fills the tank in 10 min
Pipe B fills the tank in 15 min
Pipe C empties the tank in 15/2 min

If all the three opened simultaneously then in 1 min
1/10 + 1/15 - 2/15 of the tank will be filled
that means 1/30 th of the tank will be filled in 1 min
So it will take 30 minutes to fill the tank completely if all three pipes opened
10 years agoHelpfull: Yes(4) No(0)

Tank will fill in 30 min

IN 7 and half min:

1st tab fill the tank 75%
2nd tab fill the tank 50%

3rd tab empty the tank 100%

Remaining 25% in 7.5 min

100% = 7.5 * 4 = 30 min.
14 years agoHelpfull: Yes(2) No(0)
30 min.
14 years agoHelpfull: Yes(1) No(0)
30 minutes.
14 years agoHelpfull: Yes(0) No(0)
Ans : 30 minutes
v/10 + v/15 - v/7.5 = v/30
14 years agoHelpfull: Yes(0) No(0)

Infosys Other Question

There is a five digit number, where the third number is one higher than the sum of first and second digits. Fourth digit is twice of fifth and third digit is twice the fourth. Second digit is five more than the first digit. What is the number? One thief entered a cave where he found a pile of diamonds. At first he thought of taking all. But listening to his conscience he thought of taking only half of them. But while returning he picked up two more from the pile. After that Second thief entered the cave and bagged half of remaining diamonds and picked up two more while returning. Later third thief entered and did the same. Even the fourth thief did the same. When the fifth thief entered he found only one diamond in the cave. How many diamonds are there in the cave at first.