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Upstream speed = 294/7 = 42 km/h Downstream speed = 486/9 = 54 km/h Speed of boat in still water = (42 + 54)/2 = 48 km/h Speed of stream = (54 – 42)/2 = 6 km/h Increased speed of boat in still water = 48 + 4 = 52 km/h Decreased speed of stream = 6 – 2 = 4 km/h Required time taken = 720/(52 – 4) + 616/(52 + 4) = 15 + 11 = 26 hours
Quantity 1 : A has 44% more money than B. If B spends Rs. 1748, he will have 3/8 times as much money as A. What is the total amount of money (in Rs.) wi...
A car typically travels 20% faster than a bike. The bike takes 4 hours to cover 300 km. If the car's speed were 8 km/h less than ...
A and B can complete a piece of work in 12 days and 18 days, respectively. They start working together but A leaves after 6 days. How many more days wil...
Given a mixture of 234 liters consists of water and milk in the ratio of 21:5. If 1/2 of this mixture is removed and replaced wit...
A trader cheats by using a weighing scale that shows 1 kg while actually giving only 900 grams. He also marks up the goods by 25% and then gives a 10% d...
The average selling price of mangoes is Rs. 8 (per kg) more than the average selling price of the oranges. The quantity of oranges sold is 25% more than...
The area of four walls of a room is 140 cm2. If the length and breadth of the room were equal and the height of the room is 7 cm, then what i...
Let f: [3, ∞) → R be defined by f(x) = x² – 6x + 11. The range of f is:
Two pipes can fill a tank in 10 hours and 12 hours, respectively, while a third pipe can empty it in 20 hours. If all the three pipes are opened simulta...
