Question
The lengths of trains 'P' and 'Q' are 180 metres and 120
metres respectively. Train 'P' crosses a platform 'Y' of 240 metres in 24 seconds. If 'P' and 'Q' cross each other while moving in opposite directions in 12 seconds, then find the time taken by 'Q' to cross the platform 'Y'.Solution
ATQ,
Let the speed of 'P' be 'x' m/sec So, total distance covered by 'P' while crossing the platform = (180 + 240) = 420 metres ATQ, 420 = x × 24 So, x = 17.5 m/sec Let the speed of 'Q' be 'y' m/sec Relative speed of 'P' with respect to 'Q' = (x + y) = (17.5 + y) m/sec Total distance = 180 + 120 = 300 metres ATQ, 300 = (17.5 + y) × 12 => 17.5 + y = 25 => y = 25 - 17.5 = 7.5 m/sec So, time taken by 'Q' to cross the platform = (120 + 240) ÷ 7.5 = 360 ÷ 7.5 = 48 seconds
Which of the following is not matched correctly?Â
This toxin is derived from Bacillus thuringiensis, alters the ion permeability of the midgut epithelia in insects, leading to gut paralysis and death:
Which silkworm feedw on castor tree
Which of the following is called the resting and inactive stage in the insect life cycle?
Which pest is identified by the ‘honeydew’ it secretes, which often leads to the development of sooty mold on plant leaves ?
What is the term used to describe the average density of a pest population around which it fluctuates due to biotic and abiotic factors in the absence o...
Which of the following statements is true for Entomophagy?
………………….. is associated to achieve the goal of Sweet Revolution in country
Larvae of _____________Â causes damage in redgram by webbing together flowers, pods and leaves with frass often on pods and shoot tips.
The type of antennae found in Honeybee are………………
Relevant for Exams:
