A can complete a job in 20 hours. B alone can complete the same job in 15 hrs. A work for 9 hrs and then the remaining job is completed by B. How many hours will B be alone take to complete the remaining job?
The part of job that A completes in 9 hours = 9/20 Remaining job =1 - 9/20 = 11/20 Remaining job can be done by B in 11/20*15 = 33/4 = 8*1/4hrs
The area of the base of a right circular cone is 81π cm² and its height is 12 cm. What is the curved surface area (in cm2) of the con...
(180/3)% of the raindrops could have been collected, when 8 cm of rain has fallen on a part of land of area 2.5 km2, in a tank having a 200 m...
The ratio of length to breadth of a rectangle is 5:4. If the sum of the length and breadth of the rectangle is 36 cm, then find the area (cm2...
The ratio of the length to the breadth of a rectangular park is 3:2. If a man cycling along the boundary of the park at the speed of 18 km/hr completes...
Mr. Shiva invested equal amount of money in two private firms which gives 15% simple interest per annum for 3.5 years and 5 years respectively. If the d...
Length of a rectangle is equal to the side of a square. If area of the square and rectangle is 576 m2 and 384 m2, respectively the...
Inside a square land having perimeter equal to 76 metres, leaving aside a circular land of radius 7 metres, the remaining land needs to be levelled at a...
A rectangular shaped pit of length 18 ft and breadth 16 ft is made in a rectangular field of length 64 ft and breadth 52 ft. The earth dug out of the p...
A race track is in the shape of a rectangle with length of 22 metres and area of 2200 m2. A car takes 20 seconds to make one lap around the p...
The radii of two right circular cylinders are in the ratio 3 : 2 and the ratio of their volumes is 27:16. What is the ratio of their heights?
