Question
A is twice efficient as B and B can do a piece of work
in 40 days. B started the work and after a few days A joined him. They completed the work in 32 days. From the starting, for how many days they worked together?Solution
A B Efficiency 2 : 1 B can do this job in 40 days so let total work = 1×40 = 40 units So let A work alone for x days and they work together for remaining i,e. (32-x) Hence 1×x+3(32-x) = 40 x +96 - 3x = 40 56 = 2x So x = 28 days So they work togethr for (32-x) i.e . 4 days
Two ladies simultaneously leave cities A and B connected by a straight road and travel towards each other. The first lady travels 3 km/hr faster...
A vehicle was scheduled to complete a 360 km journey in 6 hours. For the initial 4 hours, it maintained a steady speed of 56 km/h. At what minimum speed...
- A truck was moving at 50 km/hr and after ‘x’ hours it increased its speed by 15 km/hr. Then, it continued at the new speed for (x + 4) hours. If the di...
Buses A and B are moving around a circular ground of radius 420 m. If the speeds of the buses A and B are 12 m/sec and 15 m/sec respectively, then what ...
A,B and C run around a Circular track starting from the same point simultaneously and in the same direction at the speed of 8 kmph, 12 kmph and 16 kmph ...
A car traveling at a speed of 60 km/h covers a certain distance in 6 hours. If the car increases its speed by 20%, how much time will it save for the sa...
- A sphere has a diameter of 35 cm. Find its total surface area.
A train passes two people who are walking in the opposite direction of the train at the rates of 4 m/s and 10 m/sec in 12 seconds and 10 seconds respect...
A car's speed is 20% faster than that of a bike. The car takes 30 minutes longer than the bike to cover 120 km, while the bike covers 80 km. Find the ti...
On Diwali, a child Plants a bomb at a place and starts running at 60 m/s. After 58 seconds the bomb blasted. In how much time the sound of blast will be...
Relevant for Exams:
