Question
Pipe A and Pipe B could fill a tank together in 18
hours and 12 hours respectively, while pipe C could empty it in 9 hours. If both inlet pipes are opened together for first 5 hours, then pipe C replaced them. Find the time taken by pipe C to empty the tank filled by pipe A and pipe B together.Solution
Let the capacity of the tank be 36 units. (LCM of 18, 12 and 9)
Efficiency of pipe A = 36/18 = 2 units/hr
Efficiency of pipe B = 36/12 = 3 units/hr
Efficiency of pipe C = 36/9 = –4 units/hr ATQ,
Tank filled by pipe A and B together in 5 hours = (2 + 3) × 5 = 25 units
Required time = 25/4 = 6 (1/4) hr = 6 hr 15 min
A simple microscope consists of :
Which of the following statements is true when we see 'rainbow'?
Which compound is used to prepare water proof clothes?
The hormone related to drought tolerance is-
What Type of Mirror Is Commonly Used as Rear-View Mirrors in Vehicles?
Adhesive force is the force of
The instrument which uses sound waves to measure the depth of oceans is –
Electrical fuse is used to interrupt excess of _________.
The energy of wind is-
Consider the following statements:
1. A flute of smaller length produces waves of lower
2. Sound travels in rocks in the form of longitudi...
