Find the nature of the roots of 

A streamer goes downstream and cover the distance between two ports in 4 hours while it cover the same distance upstream in 5 hours. If the speed of the stream izs 2 km.per hour, then the speed of the streamer in still water is _____________

A boat covers a certain distance downstream in 3 hours, and it covers the same distance upstream in 5 hours. If the speed of the boat in still water is 8 km/hr, then the speed of the stream is

If the roots of the quadratic equation  are real and distinct, then

Two pipes running together can fill a cistern in  minutes. If one pipe takes 3 minutes more than the other to fill it, find the time taken by each pipe to fill the cistern.

An express train covers 240 km at a certain speed. Another train, whose speed is 12 km/hr less, takes an hour longer to cover the same distance. Find the speed of the express train in km/hr.

A boat can cover 10 km up the stream and 5 km down the stream in 6 hours. If the speed of the stream is 1.5 km/h, find the speed of the boat in still water.

   A car travels a distance of 180 km at a uniform speed. If the speed had been 10 km/hr less, it would have taken 3 hours more to cover the same distance. Find the speed of the car.

A cistern normally takes 10 hours to be filled by a tap but because of one open outlet pipe, it takes 5 hours more. In how many hours will the outlet pipe will empty a full cistern?

The number of real roots of equation:=9 is: