Question
Pipes 'P' and 'Q' can fill a tank in 36 minutes and 72
minutes respectively. A third pipe 'R' can empty it in 1 hour 48 minutes. 'P' and 'R' are turned on together. After 30 minutes, 'Q' is also started. Find how long in total it takes to fill the tank.Solution
ATQ,
Let the capacity of tank be 432 litres (LCM of 36, 72 and 108)
Efficiency of 'P' = 432 ÷ 36 = 12 litres/minute
Efficiency of 'Q' = 432 ÷ 72 = 6 litres/minute
Efficiency of 'R' = 432 ÷ 108 = -4 litres/minute
Filled in 30 minutes = (12 - 4) × 30 = 240 litres
Remaining = 432 - 240 = 192 litres
Time for remaining = 192 ÷ (12 + 6 - 4) = 16 minutes
Total time = 30 + 16 = 46 minutes
Pusa Deepali is a variety of:
Capitate type of antenna are found in _____
Bud scales (cataphylls) are_____ designed for protecting buds (apical or axillary).
Part of the cell wall of endodermal cells prevents water from moving into the cell is calledÂ
Eugenol is the important chemical content of:
The typical pH value of the midgut in most insects is closest to which of the following values?
Microorganisms used for suppression of plant diseases are called as ____
Judicious removal of plant part to obtain better and qualitative yield is termed asÂ
Chlorophyll is the major pigment present in leaves ,Which element is known as a ‘constituent of chlorophyll’?
Out of the following quantity, which is required to irrigate 1.0 ha land area with 50mm depth of irrigation?
Relevant for Exams:
