30 pens and 75 pencils altogether were purchased for Tk. 510. If the speed of the stream is 3 km / hr then find time taken by boat to travel 52 km downstream.

The ratio of the speed of boat in still water to the speed of stream is 16: 5. A boat goes 16.5 km in 45 minut...

A train passes a platform in 40 sec and a woman standing on the train is 108 km /hr. what is the length of the...

There are two numbers, 1st number is 12 more than the 2nd number. The average of the two numbers is 19. If 2 i...

Sum of 4 consecutive even numbers is greater than three consecutive odd numbers by 81 . If the sum of the leas...

A Number is as much greater than 36 as is less than 86 . Find the Numbers.

If A can do 1/4 of a work in 3 days and B can do 1/6 of the same work in 4 days , how much will A get if both...