Quantitative Aptitude
The speed of a boat in still water is 16 km/h, the time taken by the boat to cover a distance of 18 km upstream is equal to the time taken by the boat to travel 30Km downstream. What is the speed of the stream?
In a housing society, the ratio of two-wheelers to four-wheelers is 11 : 9. Among the four-wheelers, one-fourth are petrol vehicles and the remaining 81 are diesel vehicles. How many two-wheelers are there in this housing society?
Two right circular cones of equal volumes have their heights in the ratio 4 : 9. What is the ratio of the radii of their bases, the cones coming in the same order as that in which the ratio of their heights is given?
A can do a piece of work alone in 12 days. B is 20% more efficient than A, and C is 25% more efficient than B. In how many days can B and C together complete the work?
A car travels the first half of a journey at a speed of 80 km/h and the next half of the journey at 100 km/h. What is the average speed of the car? [Give your answer correct to 2 places of decimal.]
The average age of 24 students in a class is 15 years. When the teacher's age is included, the average increases by 1. What is the teacher's age (in years)?
