Time & Work, Chain Rule

A tank has two leakages. The first leakage alone can empty the tank in 9 minutes and the second alone would have done it in 6 minutes. If water leaks out at a constant rate, how long does it take both the leakage together to empty the tank?

Alim was hired for a job for 7 days. Each day, he was paid Tk. 10 more than what he was paid for the previous day of work. The total amount he was paid in the first 4 days of work equaled the total amount he was paid in the last 3 days. What was his starting pay?

A wheel rotates 10 times per minute and moves 20 m during each rotation. How many meters does the wheel move in 1 hour?

A time-study specialist has set the production rate for each worker on a certain job at 22 units every 3 hours. At this rate what is the minimum number of workers that should be put on the job if at least 90 units are to be produced per hour?

Distribution of work House in a Factory

The number of workers who worked from 40 to 44 hours is x times the number who worked up to 34 hours. Where x is?

দুটি মেশিন এক সাথে ঘণ্টায় 4টি খেলনা তৈরী করে। 6টি মেশিন 2 ঘণ্টায় কতটি খেলনা তৈরী করবে?

After being dropped a certain ball always bounces back to 2/5 of the height of its previous bounce. After the first bounce it reaches a height of 125 inches. How high (in inches) will it reach after its fourth bounce?

There is provision of food in fort for 1,200 soldiers for 60 days. After 15 days, 200 soldiers leave the fort. Remaining food will last for how many days. 

A wall 8 m long, 6 m high and 22.5 cm thick is made up of bricks, each measuring 25 cm × 11.25 cm × 6 cm. The number of bricks required is

Two people start jogging at the same point and time but in opposite directions. If the rate of one jogger is 2 miles per hour faster than the other and after 3 hours, they are 30 miles apart. What is the rate of the faster jogger?

A can complete a project in 20 days and B can complete the same project in 30 days. A and B start working on the project together and A quits 10 days before the project is expected to be completed. How many days in total will the project take to complete?

A and B together can paint a wall in 3 days. A can do it alone in 5 days. How many days would it take B to do this job alone?

If A can do 1/4 of a work in 3 days and B can do 1/6 of the same work in 4 days, how much will A get if both work together and are paid Tk. 180 in all?

A works twice as fast as B. If B can complete a work in 12 days independently, the number of days in which A and B can together finish the work is:

At what time between 7 and 8 O'clock will the hands of a clock be in the same straight line but, not together?

If Masud can do a job in P days, while Minhaz can do the same job in Q days separately, how long will it take to finish the job if they work together?

A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in:

A man's regular pay is Tk. 30 per hour up to 40 hours, Overtime is twice the regular payment. If he was paid Tk. 1,680, how many hours overtime did he work?

Of a pole in a pond, 0.20 portions are in mud, 0.50 of it in water and the rest 6 feet is above water. What is the length of the pole?

A can do a piece of work in 4 hours, B and C together in 3 hours, and A and C together in 2 hours. How long will B alone take to do it?