Question
Pipe ‘A’ takes 60 hours to fill a tank. Pipe
‘B’ takes 120 hours to empty it. If both are opened together, find the time required to fill 50% of the tank.Solution
Let the capacity of the tank be 240 litres.So, efficiency of pipe ‘A’ = 240 ÷ A = 4 litres/hour And efficiency of pipe ‘B’ = 240 ÷ B = 2 litres/hour So, combined efficiency of both pipes = 4 – 2 = 2 litres/hour So, time taken to fill 50% of the tank = (240 × 0.50) ÷ 2 = 120 ÷ 2 = 60 hours
The ratio of Amit’s and Bhanu’s ages will be 33:26 after 12 years. The current average age of Amit, Bhanu, and Charu is 53 years. Charu’s present ...
- A person 'X' is 8 years younger than 'Y' and also 13 years less than twice the age of 'Z'. Given that the ages of 'Y' and 'Z' are in the ratio 5:3, determi...
- Five years ago, the ratio of age of ‘A’ to ‘B’ was 4:5. Seven years from now, their age ratio will be 6:7. Find the present age of ‘Z’, who is ...
At the time of 'Binny's birth, the age of 'Ankush' was twice the present age of 'Binny'. Fourteen years from now, if the ratio of their ages is 25:13, f...
The Average age of 25 pupils in a class is ‘y’ years. If their principal, aged 50 years, joins them, the average rises by 1 year. Find the value of ...
Present age of ‘R’ is 75% more than that of ‘S’. 5 years ago, ‘R’ was 2.5 times as old as ‘S’. What is the present age of ‘S’?
...- The ratio of the ages of a mother and her daughter is 8:3, respectively. If the difference between their ages is 15 years, then find the age of the daughte...
4 years ago, the ratio of the ages of A and B was 2:3 and after 4 years it will become 4:5. Find their present ages.
Sum of the present ages of A, B, C and D is 55 years. After 5 years ratio of their ages is 5:4:3:3. What is C’s present age?
Seven years ago, 'R' and 'C' had ages in a ratio of 4:3, respectively. After seventeen years, the ratio of 'C' and 'R's ages will be 9:10, respectively....