Aptitude

Pipe A fills a tank in 6 hours, pipe B in 8 hours. Find the time to fill together.

Pipe A fills a tank in 4 hours, pipe B empties it in 6 hours. Find the time to fill if both are open.

Pipes A, B, C fill a tank in 10, 15, 20 hours respectively. Find the time together.

A tap fills a tank in 12 hours, but due to a leak takes 15 hours. Find the time for the leak alone to empty the full tank.

Two pipes fill a tank in 20 and 30 minutes; a third empties it in 15 minutes. All three opened together — find the fill time.

Pipe A fills a cistern in 6 hours. After half is filled, 3 more identical pipes are opened. Find the total time.

Inlets A and B fill a cistern in 12 and 15 hours; outlet C empties it in 10 hours. All opened together — find the fill time.

Three pipes A, B, C fill a tank in 5 hours together; C is twice as fast as B, and B is twice as fast as A. Find A's time alone.

Two taps fill a tank in 10 and 15 min separately; with a waste pipe also open, they together fill it in 18 min. Find the time for the waste pipe to empty the full tank.

A pipe fills a tank in 20 min; another empties it in 30 min. Both opened together — find the fill time.

Taps A, B, C fill a tank in 12, 15, 20 hours. All opened together, but C is closed 5 hours before the tank is full. Find the total time.

A tank is filled by pipe A in 10 hours and emptied by pipe B in 15 hours. Both opened together when the tank is 2/5 full — find the time to fill completely.

Pipes A (24 min) and B (32 min) are opened together; find after how long B should be closed so the tank fills completely in 18 minutes.

A cistern is filled by pipe A in 6 hours; due to a leak it takes 2 hours more. Find the time for the leak alone to empty the full cistern.

Pipe A fills a tank 3 times as fast as pipe B; together they fill it in 36 minutes. Find pipe A's time alone.

In what ratio should tea worth Rs 60/kg be mixed with tea worth Rs 80/kg to get a mixture worth Rs 70/kg?

Milk and water are mixed in ratio 5:1. Find the percentage of water.

A 40-litre mixture contains milk and water in ratio 3:1. Find the quantity of water.

How much water should be added to 60L milk to make the milk:water ratio 3:1?

In what ratio must rice at Rs 9/kg be mixed with rice at Rs 7/kg to get a mixture worth Rs 8/kg?

A 50L mixture has milk and water in ratio 4:1. How much water must be added to make the ratio 2:1?

Two vessels contain milk and water in ratios 3:1 and 5:3. Find the ratio in which they should be mixed to get milk:water = 1:1.

A trader mixes 26kg of rice at Rs 20/kg with 30kg at Rs 36/kg. Find the average price per kg.

In what ratio should water be mixed with milk to gain 20% by selling the mixture at the cost price of pure milk?

A vessel contains 100L of pure milk; 10L is replaced with water, repeated 3 times. Find the milk remaining.