Pipe ‘A’ can fill a tank in 30 hours whereas leak ‘A’ can empty it in 50 hours. If they both operate along with pipe ‘B’, then the given tank gets filled in 15 hours. How much time is needed to fill the given tank if pipe ‘B’ and leak ‘A’ work together?
Let the capacity of the tank be 150 litres {LCM (30 and 50)} Efficiency of pipe ‘A’ = 150 ÷ 30 = 5 litres/hour Efficiency of leak ‘A’ = 150 ÷ 50 = 3 litres/hour Combined efficiency of pipe ‘A’ and leak ‘A’ = 5 – 3 = 2 litres/hour Combined efficiency of pipe ‘A’, ‘B’ and leak ‘A’ = 150 ÷ 15 = 10 units/hour Efficiency of pipe ‘B’ = 10 – 2 = 8 units/hour Time taken by pipe ‘B’ and leak ‘A’ to fill the tank = 150 ÷ (8 – 3) = 30 hours
A shop seller offered a discount of Rs. 3500 on the marked price of a rice bag and earned a profit of 40%. If the difference between the cost price and ...
The profit earned after selling an article for Rs.1643 is the same as loss incurred after selling the article for Rs.1121. What is the cost price of the...
'A' purchased an article and sold it to 'B' at 10% profit. 'B' marked it up by 18% above the price at which 'A' has purchased it and then sold it after ...
A man bought an article at a certain price, marked it 32% above the cost price and sold it after giving a discount of 25%. If he had bought it for 20% l...
Some fruits are bought at 20 for Rs.160 and an equal number of fruits at 15 for Rs.140. If all the fruits are sold at Rs.144 per dozen, then what is the...
Kapil and Samar sold their horses at Rs 2,420 each but Kapil incurred a loss of 20%, while Samar gained 10%. What is the ratio of the cost price of the ...
An article is marked 45% above its cost price and sold after offering a discount of Rs. 80 such that its selling price is Rs. 110 more compared to its s...
A shopkeeper sells two items at the same price for Rs 2800 each. If he sells one item at 40% profit and other at 30% loss, find the loss incurred by the...
Arun purchased a TV set for Rs 14000 and a DVD player for Rs. 8000. He sold both the items together for Rs. 26400. How much percent profit did he make?<...
A shopkeeper allows two consecutive discounts of 20% and 25% on an article and still he makes a profit of 32% by selling it. He would make Rs.2332 less ...