Since there are hundreds of rules and all cannot be memorized, it is recommended to download this summary and stick on wall for practicing rules thoroughly.
A and B together can do a certain work in 36 days, whereas B and C together can do it in 30 days. A, B and C together can complete the same work in 24 days. In how many days can A alone complete \(33 \frac{1}{3} \)% of the same work?
The angle of elevation of the top of a vertical tower situated perpendicularly on a plane is observed as 60° from a point P on the same plane. From another point Q, 10 m vertically above the point P, the angle of depression of the foot of the tower is 30°. The height of the tower is
In a 1000 km trip, a man drives at a speed of 50 kmph for the first five-eighth of the total distance. If he completes the whole journey in 19 hours (resting time not included), what is his speed (in kmph, correct up to 1 decimal place) for the rest of the journey?
Pipes A and B can fill a tank in 4 hours and 6 hours 40 minutes, respectively; whereas a third pipe C can empty the full tank in 1 hours 40 minutes. A and B are opened at 2:00p.m. and 3:00 p.m., respectively and C is opened at 4:00 p.m. The tank will be completely empty at: