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Let the speed of the stream be ‘x’ km/hr Therefore, speed of the boat in still water = 10x km/hr Upstream speed of the boat = 10x – x = 9x km/hr Downstream speed of the boat = x + 10x = 11x km/hr According to the question, 11x – 9x = 20 => 2x = 20 => x = 10 Therefore, upstream speed of the boat = 9x = 90 km/hr Required time taken = 180/90 = 2 hours
A container holds 'x' liters of a mixture composed of liquids A and B in a 5:2 ratio. If 25% of this mixture is removed and then 6 liters of liquid B ar...
In a container containing 120 liters of pure petrol, 40 liters of petrol are drawn and replaced with the same quantity of diesel. This process is repeat...
400 litres of mixture X contains acetone and glycerine in the ratio 11:14, respectively. 100 litres of the mixture is withdrawn and labelled as mixture ...
Rice at Rs 80/kg is mixed with rice at Rs.40/ kg in a certain ratio such that by selling the mixture at Rs.60/ kg profit of 20% is made. If the quantity...
A container holds 80 litres of a solution which has milk and water in the ratio 3:2. 40 litres of this solution is taken out, and then 10 litres of wate...
A container holds a 512 ml mixture of milk and water in a 9:7 ratio. If 'x' ml of water and (x + 36) ml of milk are added, the new ratio of milk to wate...
In a mixture of milk & water, 60 litres water is mixed due to which ratio changes from 3 : 4 to 1 : 2. Find initial quantity of mixture. (in litres)
A container contains 60 liters of a solution containing 25% alcohol. How many liters of pure alcohol must be added to make the alcohol concentration 40%?
In a container, the ratio of milk to water is 9:7. If 32 litres of water is added, the quantities of milk and water become equal. What is the total quan...
