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  • Question
  • Two pipes A and B can fill a tank in 15 min and 20 min respectively. Both the pipes are opened together but after 4 min, pipe A is turned off. What is the total time required to fill the tank ?


  • Options
  • A. 15 min 20 sec.
  • B. 16 min 40 sec.
  • C. 13 min 10 sec.
  • D. 14 min 40 sec.

  • Correct Answer
  • 14 min 40 sec. 

    Explanation

    Part filled in 4 minutes = 4(1/15 + 1/20) = 7/15

     

    Remaining part = 1 - 7/15 = 8/15

     

    Part filled by B in 1 minute = 1/20

     

    1/20 : 8/15 :: 1 : k

     

    k = (8/15 )x 1 x 20 = 10( 2/3) min = 10 min 40 sec.

     

    The tank will be full in (4 min. + 10 min. 40 sec) = 14 min 40 sec.

  • Tags: GATE, CAT, Bank Exams, AIEEE, Bank PO, Bank Clerk

    More questions

    • 1. 

      The banker's gain on a certain sum due 1 1 years hence is 3 of the banker's
      2 25

      discount. The rate percent is:


    • Options
    • A.
      5 1 %
      5
    • B.
      9 1 %
      11
    • C.
      8 1 %
      8
    • D.
      6 1 %
      6
    • Discuss
    • 2. 
      If two marbles are picked at random, what is the probability that both marbles are red?

    • Options
    • A. 1/6
    • B. 1/3
    • C. 2/15
    • D. None of the above
    • Discuss
    • 3. A and B together have Rs. 1210. If 4⁄15 of A's amount is equal to ⅖ of B's amount, how much amount does B have?

    • Options
    • A. Rs. 460
    • B. Rs. 484
    • C. Rs. 550
    • D. Rs. 664
    • Discuss
    • 4. 
      Three taps A, B and C fill a tank in 20 min, 15 min and 12 min, respectively. If all the taps are opened simultaneously, how long will they take to fill 40% of the tank?

    • Options
    • A. 1 min
    • B. 2 min
    • C. 3 min
    • D. 4 min
    • Discuss
    • 5. 
      When 0.252525...........is converted into a fraction, then find the result.

    • Options
    • A. 25/99
    • B. 25/90
    • C. 25/999
    • D. 25/9999
    • Discuss
    • 6. 
      The sides of a triangle area in the ratio of 1/3 : 1/4 : 1/5 and its perimeter is 94 cm.
      Find the length of the smallest side of the triangle .

    • Options
    • A. 18 cm
    • B. 22.5 cm
    • C. 24 cm
    • D. 27 cm
    • Discuss
    • 7. 
      The salary of A, B, C, D, E is Rs. 8000, Rs. 5000, Rs. 11000, Rs. 7000, Rs. 9000 per month respectively, then the average salary of A, B, C, D, and E per month is

    • Options
    • A. Rs. 7000
    • B. Rs. 8000
    • C. Rs. 8500
    • D. Rs. 9000
    • Discuss
    • 8. The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is:

    • Options
    • A. 20
    • B. 30
    • C. 40
    • D. None of these
    • Discuss
    • 9. 
      Neeta borrowed some money at the rate of 6% per annum for the first 3 yr. at the rate of 9% per annum for the next 5 yr and a the rate of 13% per annum for the period beyond 8 yr. If she pays a total interest of ? 8160 at the and of 11 yr how much money did she borrow?

    • Options
    • A. ? 12000
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    • 10. Two trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train passes the slower train in 36 seconds. The length of each train is:

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