Question
John, Emily, and Michael can each complete a task in 15
days, 20 days, and 18 days, respectively. They decide to work on the task alternately, starting with John, followed by Emily, and then Michael for 15 days. The remaining work is handled by Michael alone. Calculate the total time taken to complete the entire task using this alternating work pattern.Solution
ATQ, Let the total work = 180 units {LCM of 15, 20 and 18} Efficiency of ‘John’ = (180/15) = 12 units/day Efficiency of ‘Emily’ = (180/20) = 9 units/day Efficiency of ‘Michael’ = (180/18) = 10 units/day So, work completed in 3 days = (12 + 9 + 10) = 31 units Work completed in 15 days = 31 × 5 = 155 units Time taken by ‘C’ to complete the remaining work = (180 – 155)/10 = 2.5 days Therefore, total time taken = 15 + 2.5 = 17.5 days
Which technique is more useful for seeding cold clouds?
Which one of the following is NOT a quality parameter of rice grain?
Calculate the water conveyance efficiency if water delivered to the farm is 84 mm and water diverted from the source is 140 mm.
Which of the following is a highly salt tolerant crop?
The great Irish famine was caused byÂ
The four principles of organic farming do not includeÂ
Bread wheat is:
Which technique uses double stranded RNA (dsRNA) as a trigger that targets homologous mRNAs for degradation or inhibiting its transcription translation?...
Which country is the largest producer of Mango in the world?
The temporary roots in maize root system are:
Relevant for Exams:
