A boat running upstream takes 5hours24minutes to cover a certain distance, while it takes 4hours to cover the same distance in running downstream. What is the ratio between the speed of the boat and the speed of stream?
The sum of the first 6 terms of an arithmetic progression is 156. The ratio of term 10th to term 30th of the AP is 39:119. What is the value of the 78th term of the AP?
Marcela drew the following figure in her mathematics notebook. In which AB and BC are co-initial tangents drawn from an external point A to the circle OB and OC are the radii of the circle. Then what is always true ?
There are a cylinder and a cone with height, h and radius r. There is also a sphere of the same radius. The height, h of the cylinder and the cone is 3 times the radius, r. If V1 is the volume of the cylinder, V2 is the volume of the cone and V3 is the volume of the sphere, then which of the following is true?