Question
What is the process that describes the changes in whole
communities as different species colonize an area and change its environment?Solution
Ecological succession is the process of ecosystem development involving changes as different species colonize an area.
A swimmer swims from a point A against a current for 5 minutes and then swims current for next 5 minutes and comes to the point B. If AB is 100meters, t...
The downstream speed of a boat is 25% more than its upstream speed. The boat takes 3.2 hours to travel 57.6 km upstream.
W...
The speed of the stream is 20 km/h. Boat ‘A’ covers 120 km distance against the stream in 6 hours and boat ‘B’ covers 120 km distance against th...
A boat can cover 84 km upstream and 252 km downstream in 14 hours. Speed of the stream is how much less than the speed of the boat in still water if the...
Motor boat covers a certain distance downstream in a river in 20 hours. It covers the same distance upstream in 30 hours. If the speed of the water is 1...
A boat takes 3 hours 45 minutes to cover 67.5 km in downstream. The ratio of the speed of the boat in still water to the speed of the stream is 5:1. Fin...
Ratio of still water speeds of three boats is 3:4:5. The first boat travels downstream, the second and third boats travel upstream. They travel in strea...
- A launch covers 225 km in downstream in 5 hours. If the upstream speed is one-third of the downstream speed, find the time needed to travel 150 km upstream...
A boat takes 20 hours to go 200 km upstream. If the boat doubles its speed, it can cover 200 km downstream in 4 hours. Find the speed of the stream.
A boat makes a journey from point P to point Q and return back in 6 hr 40 min. One way it travels with the stream and on the return it travel against th...
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