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Dmitry Ivanovsky was a pioneer in the discovery of viruses, having conducted foundational research that led to the identification of these infectious agents.
Speed of a boat in still water is 11 kmph and speed of stream is 9 kmph. A man rows to a place at a distance of 40 km and come back to starting point. T...
A boat covers a distance of 96 km downstream in 4 hours and returns upstream in 6 hours. Find the speed of the stream.
The cost price of an item is 60% less than its marked price, which is 50% more than its selling price. What is the profit percent...
The ratio of the speed of a boat in still water to its speed in downstream is 6:8. If the difference between the time taken by the boat to travel 288 km...
A man can swim at the rate of 8 km/hr in still water. If the speed of the water is 3 km/hr, then the time taken by him to swim 15 km upstream is
A steamer covers 80 km in 5 hr. in still water. If the speed of the steamer in still water is 50% more than that of the stream, then time is required fo...
A boat can cover 90 km upstream and 225 km downstream in 15 hours. Speed of the stream is how much less than the speed of the boat in still water if the...
The income of ‘A’ increases by 20% every year. If his income 3 years hence from now will be Rs. 13478.4, then find his income a year before from now...
A boat goes 50 km in upstream in 5 hours and takes 3 hours to complete a distance of 18 km in downstream. Find the speed of boat in still water.
Speed of a boat in still water is 9 kmph and speed of stream is 6 kmph. A man rows to a place at a distance of 30 km and come back to starting point. Th...
