Question
Boat ‘A’ can cover 100 km in still water in 10
hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 2:3 and the speed of stream is 3 km/hr then find the time taken by boat ‘B’ to cover the 378 km in downstream.Solution
Speed of boat ‘A’ in still water = 100/10 = 10 km/hr Speed of boat ‘B’ in still water = 10 × (3/2) = 15 km/hr Downstream speed of boat ‘B’ = 15 + 3 = 18 km/hr Time taken by boat ‘B’ to cover 378 km in downstream = 378/18 = 21 hours
Given below are two statements:
Statement I: Orobanche (Broomrape) is a total-root parasitic weed in rapeseed mustard.
Statement II: Strig...
Plant origin insecticides are:
A. Nicotine
B. Arsenicals
C. Pyrethrum
D. Phosphamidon
E. Rotinone
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Which of the following is the most suitable crop to cultivate on heavy black cotton soils, especially under dryland conditions?
Which of the following is not a variety of bajra:
The bulk density of clay soil is approximately:
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