Let speed of boat in still water and speed of boat in upstream be ‘12x’ km/h and ‘7x’ km/h, respectively. Speed of stream = 12x – 7x = 5x km/h Speed of boat in downstream = 12x + 5x = 17x km/h So, 17x = 340/5 = 68 Or, x = 4 Speed of boat in still water = 12 × 4 = 48 km/h Desired time = 16/48 = 20 minutes
A storeroom has only steel and copper rods in the ratio 4:3, respectively and the weight of each steel and each copper rod is in the ratio 5:6, respecti...
A frustum of a cone has a lower base radius of 12 cm, an upper base radius of 8 cm, and a height of 15 cm. Find the total surface area of the frustum.
A sum of Rs. 21500 was lent partly at 4% p.a. and remaining at 6% p.a. simple interest. The total interest received after 3(1/2) years is Rs. 3521. The ...
The length and width of a rectangle are in the ratio of 11:8. Additionally, the length of the rectangle is 54 cm less than its perimeter. Using this in...
The difference between the area of a circle and the area of the rectangle is 290.16 cm2. If the length of rectangle is 25% more and breadth i...
Taking any three of the line segments out of segments of length 2 cm, 5 cm, 7 cm and 8 cm, the number of triangles that can be formed is:
The area of a regular hexagon with side as 6 cm is
The diameter of the base of a cylindrical drum is 70 cm and its height is 15 cm. The drum is full of water and the water from the drum is transferred to...
