Question
Two pipes A and B can fill a tank in 15 hours and 20
hours, respectively. If both pipes are opened together and then pipe A is closed after 5 hours, how long will it take for pipe B to fill the tank?Solution
Work done by pipe A in one hour = 1/15. Work done by pipe B in one hour = 1/20. In 5 hours, work done by A = 5 * (1/15) = 1/3. Remaining work = 1 - 1/3 = 2/3. Now, only pipe B is working. Work done by B in one hour = 1/20. Time taken by B to fill the remaining tank = (2/3) / (1/20) – 5 hours = (2/3) * 20 -5      = 40/3 -5 hours ≈ 8.33 hours. Correct option: d) 8.3 hours
Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
FMD_ B_ZA _MVW TM_S PMN_
Four of the following five are similar in a certain way, which creates a group.Â
Which of these is not related to this group?Â
U, R, Y, S, W
In a certain code language, ‘CARD’ is coded as ‘7359, ‘SERV’ is coded as ‘1256’and ‘PACK’ is coded as ‘8497’. What is the code for...
Select the figure that will come next in the following figure series.
In the question below, some letters are given in two ovals, intersecting each other. The letter(s) given in the intersected portion can be used more th...
Three Statements are given followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with c...
Venu, Sonia, Kamal, Ria and Aish are sitting on a bench. Sonia is sitting to the right of Kamal, who is not sitting at extreme end of the bend. Ria is s...
Statements:
Some movies are dramas.
Some dramas are fiction.
Conclusions:
I. Some movies are fiction.
II. All fic...
In the question below, some letters are given in two ovals, intersecting each other. The letter(s) given in the intersected portion can be used more th...
Three of the following four are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group?
(NOTE: Operati...
