Question
Two pipes can fill a cistern separately in 36 minutes
and 45 minutes, respectively. A waste pipe can drain off 40 litres per minute. If all the three pipes are opened, the cistern fills in one hour. The capacity (in litres of the cistern) is:Solution
Let's denote the capacity of the cistern as C liters. We then have: The rate of the first pipe is C/36 liters per minute. The rate of the second pipe is C/45 liters per minute. The waste pipe drains at a rate of 40 liters per minute. When all three pipes are open, the cistern is filled in 60 minutes (1 hour), meaning the net rate is C/60 liters per minute. (C/36) + (C/45) - 40 = C/60 5C + 4C-7200 = 3C 6C = 7200 C = 7200/6 = 1200 So, the capacity of the cistern is 1200 liters.
They also lay claim to being the only brothers to finish first and second in the same race.
- The following sentence has been divided into parts. One of them contains an error. Select the part that contains an error from the given options. If the se...
From on of the windows of my flat I can see the Qutub minar,” said my friend.
Plastics represent an example of (A)/a consumption externality, which involves much people, (B)/rather than a production externality, (C)/which involve...
In the question below, a sentence is given, divided into five parts (A) , (B) , (C) , (D) and (E) . One of the parts is grammatically incorrect or has ...
You should avoid (A)/to look into these matters as (B)/they are complicated and could be (C)/handled only by a professional (D).
Read the given sentence to find out whether there are any grammatical/ contextual errors in them. The errors, if any, will be in two of the parts of th...
In the question given below, a sentence is given, divided into parts. One of the parts may contain an error. Identify the part that contains the error,...
Read the following sentence carefully and identify if there is any grammatical error in it. If you find any error, choose the part (A, B, C, or D) con...
Guru Gobind Singh said it was our duty to come to the defence of all those who were threatened through no fault of their own.
