Question
A man can row 5 km/hr in still water. If the speed of
the current is 2 km/hr, it takes 4 hours more in upstream than in the downstream for the same distance. Find the distance.Solution
Speed of man in still water = x = 5 km/hr Speed of current = y = 2 km/hr Let the distance be x km. Now according to the question, Upstream time = Downstream time + 4 => x/(5-2) – x/(5+2) = 4 => x/3 – x/7 = 4 => [(7x - 3x)/21] = 4 => x = 21 km
Which type of engine has one power stroke for every revolution of the crankshaft?
Consider the following statements regarding pest management in rice and choose correct options-
(A). ETL for rice earhead bug in milky stage is 1...
Water requirement of crops is the amount of water needed for:
Scientific name of CowpeaÂ
What method of propagation is commonly used in pineapple cultivation?
TRYSEM is related to ____
Microorganisms used for suppression of plant diseases are called as ____
Choosing nursery stock with higher levels of secondary plant compounds for resistance breeding would exemplify which plant resistance mechanism?
Polymorphism in fungi was first observed by:
Weed cause relatively more yield loss of rice when the crop isÂ
Relevant for Exams:
