Speed of a boat in still water is three times the speed of the boat in upstream. If the boat takes 20 minutes to cover 20 km in downstream, then find the speed of the boat in still water.
Let speed of the boat in still water be ‘3x’ km/h. Speed of the boat in upstream = 3x ÷ 3 = ‘x’ km/h Speed of the stream = 3x – x = ‘2x’ km/h Speed of the boat in downstream = 3x + 2x = ‘5x’ km/h ATQ; (20/20) × 60 = 5x So, 5x = 60 Or, x = 12 So, speed of the boat in still water = 3 × 12 = 36 km/h
Which of the following is a benefit of Zero Budget Natural Farming?
Soil water is lost from the soil surface and from the rooting zone of the plant by the following respectively
Buggy whipping condition in sorghum is caused by
When pollen from a flower of one plant falls on the stigmas of other flowers of the same plant, as in Maize is known as ______
Which among the following is not a least abundant macronutrients in plants?
“Regional Centre of International Rice Research Institute” is recently established in India at:
Which of the following types of pesticide formulation is mainly used in storage structures/seed godowns?
Raising of the re-growth obtained from roots of stalks after harvest of a crop is termed as:
Match List-I with List-II and select the correct answer using the codes given below the lists.
Among the microorganisms listed below, which one is commonly used as a bio-fertilizer for pulse legumes, oil legumes, and fodder legumes?