firstly Ashish is studying chemistry and sitting at the third position to the left of ruby so fix one position for Ruby and place Ashish according to that and kartik is sitting on the same side of Ashish. 
Step II: Rocky is the neighbour of Ashish and Nitish is sitting between Ruby and Saina and study Economics so according to that the arrangement will be: 
Step III: Saina study Maths and sits second to the left of Rocky who study computer science. 
Step IV: The neighbour of Kartik study English and Ashish already study chemistry so the person sitting to the immediate right of Kartik will be studying English. 
Step V: Harsh study Hindi and there is only one position vacant which is to the immediate right of Saina so Harsh will be sitting there and the remaining subject is physics so Kartik will be studying that subject and the person remaining is Aman so he will be siting with Ruby and will study English. Here CS=computer science. 
An empty tank can be filled by an inlet pipe in 10 hours, while an outlet pipe can empty it in 15 hours. If we open (N - 1) outlet pipes of the same cap...
Pipe ‘A’ can fill a tank in 12 hours while pipe ‘B’ takes 15 hours to empty it. Pipe ‘A’ is opened alone when the tank was empty and after 1...
Pipes A and B alone can fill a tank in 12 minutes and 18 minutes, respectively, while pipe C alone can empty the full tank in 36 minutes. If all the pip...
There was the leakage in the Oil tanker. If 20 litre of oil is leaked out per day then it would have lasted for 50 days and if the leakage was 32 litre ...
A large cistern can be filled by two pipes, P and Q, in 16 minutes and 24 minutes, respectively. Pipe R can empty the cistern in ...
Tap A can fill a tank in 9 hours. Tap B can fill 37.5% part of the same tank in 3 hours, whereas Tap C can alone empty a tank in ‘x’ hours. 2/5 part...
Pipes ‘A’ and ‘B’ can fill a tank in 6 hours and 9 hours, respectively. If pipe ‘C’ is opened along with pipes ‘A’ and ‘B’, then the...
Pipe A alone fill the tank in x hours and Pipe B alone fill the tank in (x – 6) hours. If the efficiency of pipe B is double of pipe A and pipe A ...
Pipe Y is 25% less efficient than pipe X. Together, pipes X and Y can fill a tank in 15 minutes. Pipe Z alone can empty the tank ...
Pipe 'A' and pipe 'B', alone can fill a tank in 20 minutes and 30 minutes, respectively. Both the pipes were opened together to fill the tank, but later...
