Related Questions

If Arif works alone he will take 20 more hours to complete a task than if he works with Babu to complete the task. If Babu work alone, he will take 5 more hours to complete the task than if he works with Arif to complete the task. What is the ratio of the time taken by Arif to than taken by Babu if each of them works alone to complete the task?
A 2 : 1
B 5 : 3
C 7 : 5
D None of these
Rakib can complete a task in 30 minutes, and together with his brother Momin, he can complete the task in 20 minutes. How long would it take for Momin working alone to complete the task?
A 30 minutes
B 40 minutes
C 50 minutes
D 60 minutes
If 12 man work on a particular task. It takes them 24 days to complex it. On the other hand 12 women can complete the same task in 12 days. How many days would it take if the 12 man and 12 women complete with each othre to finish the same task?
A 5 days
B 6days
C 8 days
D 16 days
two workers, working sepparately but at the same speed,take 2 hours 40 minutes to complete a particular task.How long will one of these two workers take to complete the same task alone?
A 1 hour 20 minutes
B 4 hours 40 minute
C 5 hours
D 5 hours 20 minute
Two workers, working separately but at the same speed, take hours 40 minutes to complete a particular task, How long will one of these two workers take to complete the same task alone?
A 1 hours 20 minutes
B 4 hours 40 minutes
C 5 hours
D 5 hours 20 minutes
A and B can complete a task in 12 days. However, A had to leave a few days before the task was completed and hence it took 16 days in all to complete the task. If A alone could complete the work in 21 days, how many days before the work getting over did A leave?
A 7
B 5
C 9
D 3
A can complete a task alone in 8 days, while B takes 12 days to do it by herself. Together with C it takes them 4 days to complete the work. If C and D together can complete the task in 15 days, then how many days will D need to complete the task by herself?
A 36
B 32
C 40
D 30
At Uttara High school each student studies exactly one foreign languages. Three-fifth of the students take Spanish and one-fourth of the remaining students take take German. If all of the others take French, What percent of the students take French?
A 10
B 30
C 20
D 25
Committee X has 4 members, committees Y has 5 members, and these committees have no members in common. If a task force is to be formed consisting of one member of X and one member of Y, how many different task forces are possible?
A 6
B 9
C 10
D 20
Rumi and Rony can finish a task, working together, in 12 days. If Rony alone can finish that in 20 days, how many days will Rumi need to finish the task working alone ?
A 30
B 20
C 25
D 33

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