Adi has a pipe that can fill a tank in ‘2H’ hours and another pipe can empty it in ‘Q’ hours. How long will it take to fill the tank if both the pipes are used together? (Given Q > H)

# Fire Operator Exam

## Mona has two taps near her swimming pool. Tap X can fill the pool in 36 minutes, Tap Y can fill the ….

Mona has two taps near her swimming pool. Tap X can fill the pool in 36 minutes, Tap Y can fill the same pool in 48 minutes. If they are opened simultaneously, at what time tap Y (keep tap X running) can be stopped so that the tank can...

## If three taps empty a tank in 3 hours. The first tap alone can empty it in 6 hours and second tap al….

If three taps empty a tank in 3 hours. The first tap alone can empty it in 6 hours and second tap alone can empty it in 9 hours respectively. How many hours would the third tap alone take to empty the tank?

## Two petrol pipes X and Y can fill a tank in 15 hours and 20 hours, respectively. How long will it ta….

Two petrol pipes X and Y can fill a tank in 15 hours and 20 hours, respectively. How long will it take to fill the tank with petrol, if both the pipes are used together?

## Tap at Anil’s house can fill a cistern in 5 hours and another tap at Ashok’s house can empty the sam….

Tap at Anil’s house can fill a cistern in 5 hours and another tap at Ashok’s house can empty the same cistern in 6 hours. How long will it take for the cistern to fill if both the taps are turned on?

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## 5 boys or 9 girls completed a graffiti in 19 days .How long will it take to complete the same graff….

5 boys or 9 girls completed a graffiti in 19 days .How long will it take to complete the same graffiti with 3 boys and 6 girls ?

## Athiya and Dean can do a piece of work in 30 days, while Dean and Cathy does the same work in 24 day….

Athiya and Dean can do a piece of work in 30 days, while Dean and Cathy does the same work in 24 days. Athiya and Cathy can complete the same work in 20 days. They all work for 10 days and then, Dean and Cathy leave. How many more...

## Aru and Sharan can do a piece of work in 10 days, Sharan and Catie can do it in 12 days, and Aru an….

Aru and Sharan can do a piece of work in 10 days, Sharan and Catie can do it in 12 days, and Aru and Catie can do it in 48 days. In how many days can they do the same piece of work, if all of them work together?

## An amount of money maintains a family of 18 men for 15 days when sugar is 10 kg a dollar. How long w….

An amount of money maintains a family of 18 men for 15 days when sugar is 10 kg a dollar. How long will the same amount of money maintain a family of 6 men when sugar is 14 kg a dollar?

## Edwin and Albert complete a piece of work in 12 days and 20 days, respectively. Edwin alone started ….

Edwin and Albert complete a piece of work in 12 days and 20 days, respectively. Edwin alone started the work and after 4 days Albert joined him. (i) How much work did Edwin do in 4 days?(ii) In how many days can both finish the balance work together?

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