Subject
Bank Exam
Topic
Exim Bank Trainee Officer 2016
A man can do a job in 15 days. His father takes 20 days and his son finishes it in 25 days. How long will they take to complete the job if they all work together?
A man can do a job in 15 days. His father takes 20 days and his son finishes it in 25 days. How long will they take to complete the job if they all work together?
ক)
Less than 6 daysখ)
Exactly 6 daysগ)
More than 10 daysঘ)
Approximately 6.4 daysExplanation
In a day three of them do together do = (1/15+1/20/1/25)= 57/300 part of the work 57/300 part of the work in 1 day so,total part of the work = 300/57 = 6.4 day(approx)Related questions
How many times in a day, the hands of a clock are straight?A and B invest in a business in ratio 3: If 5% of the total profit goes to charity and A’s share is Tk. 855, the total profit is:A man is 24 years older than this son. In two years, his age will be twice the age of his son. The present age of the son is:Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If a is open all the time and B and C are open for one hour each alternately, the tank will be full in:The difference of two numbers is 20% of the larger number. If the smaller number is 12, the larger one is:The difference between the local value and the face value of 7 in the numeral 32675149 isAn amount of Tk. 735 was divided between A, B and C. If each of them had received Tk. 25 less, their shares would have been in the ratio of 1:3: The money received by C was:If a number x is 10% less than another number y and y is 10% more than 125, then x is equal to: