A pipe can fill a tank in 0.9 hours and another pipe can empty in 0.7 hours. If tank is completely filled and both pipes are opened simultaneously then 450 liters of water is removed from the tank is 2.5 hours. What is the capacity of the tank?
A. 200 liters
B. 350 liters
C. 456 liters
D. 567 liters
E. None of these
Answer: Option D
Solution(By Examveda Team)
Pipe A can fill the empty tank in = 0.9 hours So work rate of the Pipe A = $$\frac{{100}}{{0.9}}$$ % per hour Pipe B can empty the tank in = 0.7 hours Negative Work rate of B = $$\frac{{100}}{{0.7}}$$ % per hour. (B is removing water, so, taken as negative work) Tank fill per hour = $$\frac{{100}}{{0.7}} - \frac{{100}}{{0.9}}$$ = 31.75% per hour Time Taken to empty the tank = $$\frac{{100}}{{31.75}}$$ ≈ 3.15 hours So, Capacity of the tank = 3.15 × 180 = 567 litersJoin The Discussion
Comments ( 2 )
Related Questions on Time and Work
A. 18 days
B. 24 days
C. 30 days
D. 40 days
Explained 180:
Removal of water per hour.
450*10/25=180(as it takes 2.5 hours or 25/10 hours)
Where you find 180 please explain