Question
Tap ‘A’ and tap ‘B’ can fill a tank in 42 hours
and 30 hours, respectively. If both taps are opened together, then find the time after which tap ‘A’ must be closed so the whole tank can be filled in 20 hours.Solution
Let total capacity of the tank is 210 litres (LCM of 42 and 30) Quantity of water filled by tap ‘A’ in one hour = 210/42 = 5 litres Quantity of water filled by tap ‘B’ in one hour = 210/30 = 7 litres Let tap ‘A’ is closed after ‘x’ hours So, 12 × x + 7 × (20 – x) = 210 Or, 5x = 70 Or, x = 14 hours
………. was launched in India on the occasion of ICAR golden jubilee celebration year
...The Price Support Scheme (PSS) under PM-AASHA covers which of the following crops?
The inhibition of lettuce seed germination at temperatures higher than 30°C is an example of:
Basic unit of civilization is
 What is the seed rate of hybrid cotton with a spacing of 120 × 60 cm?
In marketing, place utility is created through
The World Trade Organization (WTO) is the successor to
Which cereal crop is most tolerant to saline and alkali soils
What is the name of the improved variety of the national flower Lotus launched by CSIR-National Botanical Research Institute?
Which of these green house gas is most abundant in the atmosphere?
Relevant for Exams:
