Reference : Time & Work
Q1. A pipe can fill a tank in 12 hours. Another pipe can fill the same tank in 18 hours. How long will it take to fill the tank if both pipes are used simultaneously?
5.4 hours
7.2 hours
8 hours
6.75 hours
Q2. A group of 24 workers can complete a project in 16 days. How many days will 36 workers take to complete the same project?
11 days
12 days
8 days
10.66 days
Q3. A worker can complete a job in 20 days. Another worker can complete the same job in 30 days. The first worker works for 8 days and then the second worker completes the remaining work. How many days will the second worker take to complete the remaining work?
10 days
14 days
16 days
12 days
Q4. Three machines P, Q, and R can complete a task in 12, 15, and 20 days respectively. What is the time taken if all three machines work together?
7.2 days
6 days
4.8 days
5.45 days
Q5. A group of 15 workers can complete a project in 40 days. How many days will 10 workers take to complete the same project?
45 days
55 days
50 days
60 days
Q6. Two pipes can fill a tank in 12 and 18 hours respectively. A third pipe can empty the tank in 36 hours. How long will it take to fill the tank if all three pipes are used simultaneously?
8 hours
10 hours
11 hours
9 hours
Q7. A job can be completed by A in 12 days, by B in 15 days, and by C in 20 days. If A works for 3 days, B for 4 days, and C for 5 days, how much of the job remains?
3/4 job
2/3 job
1/3 job
1/2 job
Q8. Four identical machines can complete a job in 16 days. If two of these machines break down, how many days will the remaining machines take?
36 days
24 days
28 days
32 days
Q9. 10 workers can complete a job in 24 days. 5 of these workers are replaced by workers half as efficient. How many days will the new workforce take?
28 days
40 days
32 days
36 days
Q10. A tank can be filled by a pipe in 20 hours and can be emptied by another pipe in 30 hours. If both pipes are opened simultaneously, in how many hours will the tank be filled?
45 hours
50 hours
40 hours
60 hours
Other References :
AP & GP : Link
Area : Link
Average : Link
Boat & Stream : Link
Compound Interest : Link
Height & Distance : Link
LCM & HCF : Link
Logarithm : Link
Percentage : Link
Profit & Loss : Link
Ratio & Proportion : Link
Simple Interest : Link
Speed Distance : Link
Time & Work : Link
Trains Problem : Link
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