A boat sailing against a stream of of river takes 6 hours to travel 24 kms, while sailing with the stream it takes 4 hours to travels the same distance. What is the speed of the stream ?

A milkman purchases the milk at Tk. x per liter and sells it at Tk. 2x per liter still he mixes 2 liters water...

A man could buy a certain number of notebooks for Tk. 300. If each notebook cost is Tk. 5 more, he could have...

4 men and 6 women can complete a work in 8 days while 3 men and 7 women can complete it in 10 days . In how ma...

Two -fifth of one -fourth of three seventh of a number is 15. what is the half of the number ?

Length of a train is 170 meters and speed of train is 63 km / hr . This train can pass a bridge in 30 seconds...

A water tank has two taps (Tap1 -Tap2) . Tap -1 can fill a tank in 8 hours and Tap- 2 can empty the tank in 16...