A boat covers a certain distance downstream in 1 hour, while it comes back in 1.5 hour. If the speed of the stream be 3 km/hr. What is the speed of the boat in still water?

Tk. 385 has been divided among A , B,C in such a way that A receive 2/9th of What B and C together receive . T...

Mother's age today is thrice as her daughter's . After 10 years it would be just double. How old is the daught...

A boat can travel with a speed of 13 km /hr in still water. If the speed of the stream is 4 km/hr, find the ti...

In what time will the simple interest on Tk. 400 at 10% per annum be the same as the simple interest on TK. 10...

A student multiplied a number by 3/5 instead of 5/3 , What is the percentage error in the calculation?

A car covers four successive 7 km distance at speeds of 10 km/hr, 20 km/hr, 30 km/hr and 60 km/hr , respective...