Lichens are composite organisms made up of fungi and algae or cyanobacteria in a mutualistic relationship. Lichens absorb pollutants like heavy metals, sulfur, and nitrogen compounds from the air, making them effective bio-indicators of air quality and useful in reducing pollution levels.
The speed of the boat and the speed of the stream is 15km/hr and 3km/hr individually. The boat travel for a period of 3 hours upstream and 4 hours downs...
A man can row at 36 km/hr in still water. In a stream which is flowing at 12 km/hr, it takes him 3 hrs to a place and back. How far is the place?
If a river is flowing at a rate of 6 km/hr and a boat's speed in still water is 100% higher than the river's speed, and the boat travels 'd' kilometers ...
A man rows a boat a certain distance downstream in 9 hours, while it takes 18 hours to row the same distance upstream. How many hours will it take him t...
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...
The speed of boat downstream and upstream is 28 km/hr and 18 km/hr respectively. Time taken to travel a distance of (m + 35) km downstream and (n + 22) ...
A boat travels 315 km downstream in 7 hours and 135 km upstream in 9 hours. Determine the total time the boat takes to cover 150 ...
The speed of a boat in still water is 20 km/hr. If the boat covers 90 km in upstream in 9 hours, then find the time taken by the boat to travel 150 km i...
The speed of a boat in still water is 9 km/hr and speed of current is 5 km/hr. If time taken to cover a certain distance upstream is 14 hours, then how ...
The combined speeds of boats 'P' and 'Q' in still water amount to 52 km/hr. The current's speed affecting boat 'P' is 25% greater than that affecting bo...
