The ratio of efficiencies of Rahul and Ramesh to finish the same work is 4 : 5. Rahul worked alone for 8 days and then Ramesh joined him and worked for 16 days to finish the work. In how many days Rahul can finish the work alone?
Sunil is driving a car with a velocity of 40 kmph in the direction of the river along the river bank. A boat which is at a distance of 12 km from Sunil crossed him in 8 minutes by rowing against the flow of the river. If the river is flowing with a velocity of 4 kmph, then what is the velocity of the boat?
Three pipes A, B and C can fill a tank together in 8 hours. A and B can fill the tank together in 16 hours. A and B filled the tank for 8 hours and the remaining is filled by pipe C. What is the time taken by pipe C to fill the tank?
Language is remarkable, except under the extreme constraints of mathematics and logic, it never can talk only about what it's supposed to talk about but is always spreading around.
Raju Sharma
"Mathematics is just a game of greatest fun so every one should play it "