Question
Pipes X and Y can fill a tank in 48 minutes and 80 minutes
respectively. Another pipe Z can empty the tank in 2 hours. X and Z are opened together. If after 36 minutes, Y is also opened, then how long will it take to fill the tank completely?Solution
ATQ,
Let the capacity of the tank be 240 litres (LCM of 48, 80 and 120)
Efficiency of X = 240 ÷ 48 = 5 litres/minute
Efficiency of Y = 240 ÷ 80 = 3 litres/minute
Efficiency of Z = 240 ÷ 120 = -2 litres/minute (since it is an outlet pipe)
Tank filled in 36 minutes = (5 - 2) × 36 = 108 litres
Remaining tank to be filled = 240 - 108 = 132 litres
Time to fill remaining = 132 ÷ (5 + 3 - 2) = 132 ÷ 6 = 22 minutes
Total time taken = 36 + 22 = 58 minutes
If '+' means '×', '×' means '–', '–' means '÷' and '÷' means '+', then what will come in place of the (?) in the following equation?
250 ...
A square sheet of paper is folded along the dotted line successively along the directions shown and is then punched in the last. How would the paper loo...
In the data set given below, what is the difference between the Median and the Mode?
{2.1, 5, 6, 7, 8, 9.3,11,15, 17, 19.21, 27, 31, 31, 33, 16.5, 14, 10}
Each of P, Q, R, S, T, U and V has exam on different day of the same week starting from Monday and ending on Sunday. R's exam is immediately before U's ...
In a certain code language, 'HOUSE' is written as '81261922' and 'INK' is written as '181411'. How will 'MISTAKE' be written in that language?
A, B, C, D, E, F and G are sitting around a circular table, facing the centre. Only one person sits between F and C when counted from the left of C. B s...
Select the number from among the given options that can replace the question mark (?) in the following series.
5, 6, 10, 19, 35, 60,?
What should come in place of the question mark (?) in the given series?
127 119 111 103 95 87 ?
Select the correct option from the given options that can make a full square. (3 of the 5 images given below are given)
Which is the one that does not belong to the group?
Relevant for Exams:
