Question
A man can row 16 km/hr in still water. It takes him
thrice as long to row up as to row down the river. Find the speed of the man against the current.Solution
Let man’s rate upstream be x kmph. Then his rate downstream = 3x kmph. 
Rate in still water =   kmph = 2x kmph 16 = 2x x = = 8, So, Rate upstream = 8 kmph.
The volume of a solid cube is 2744 m3. If whole cube is to be painted at a rate of Rs. 7.5 per m2, then what will be the cost of p...
The cost of fencing a rectangular field at the rate of Rs. 5/metre is Rs. 350. If the length of the field is 11 metres more than its breadth, then find ...
If the length of a rectangle is extended by 25% and its width is reduced by 20%, what is the percentage difference in the rectangle's area as a result o...
- A wire is bent to form a square which covers an area of 36 cm². Later, it is reshaped into a circle. What is the area enclosed by the circle? (Use π = 3)
A rectangular park is 60 m by 45 m. A 3 m wide path runs inside along the boundary. Find the area of the path.
Find the perimeter of a rectangle whose length is 30 cm more than the side of a square whose perimeter is 64 cm. The breadth of rectangle is 18 cm less ...
If the length of the diagonal of a square is 9.2 cm, then the area of the square is:
The length, breadth and height of a storeroom are 17m, 10m and 12m respectively. If each box occupies 40 m3 of space, then how many boxes can...
In a right-angled triangle PQR, right-angled at Q, the length of the side PR is 17 units, length of the base QR is 8 units, and length of the side PQ i...
