Question
A boat takes 7 hours to cover 266 km upstream and 9
hours to cover 468 km downstream. Find the time taken by the boat to cover 528 km upstream and 540 km downstream if speed of boat in still water is increased by 4 km/h and speed of stream is decreased by 2 km/h.Solution
Upstream speed = 266/7 = 38 km/h Downstream speed = 468/9 = 52 km/h Speed of boat in still water = (38 + 52)/2 = 45 km/h Speed of stream = (52 – 38)/2 = 7 km/h Increased speed of boat in still water = 45 + 4 = 49 km/h Decreased speed of stream = 7 – 2 = 5 km/h Required time taken = 528/(49 – 5) + 540/(49 + 5) = 12 + 10 = 22 hours
The Only nutrient whose form is available as both anion and cationic form is
Which of the following is a complex fertilizer?
In soil, net Immobilization of Carbon & Phosphorus occurs when ratio is:
Largest soil order in world is
Nutrient that imparts winter hardiness to plant is____
The Indian seed act was passed in the year
How many seasons are there for seed certification in India?
The EC of Sodic soil is __mmho/cm at 25 ℃ .
The critical nutrient range in the context of soil fertility is explained by?
Which law defines the relationship between the settling velocity of soil particles and their size in a liquid medium?
