Question
Pipe 'A' takes 20 minutes to fill half of the tank. Pipe
'B' is twice as efficient as pipe 'A'. Find the percentage of the tank filled by both in 8 minutes.Solution
Time taken by pipe 'A' alone to fill the entire tank = 20 × 2 = 40 minutes Let efficiency of pipe 'A' = x units/minute Tank capacity = 40x units Pipe 'B' efficiency = 2x units/minute Work in 8 minutes = (x + 2x) × 8 = 24x units Percentage filled = (24x / 40x) × 100 = 60%
‘A’ and ‘B’ started moving towards each other at same time with a speed of 22 km/hr and 14 km/hr, respectively. If the distance covered by ‘A�...
A man travels some distance at a speed of 36 km/hr and returns at a speed of 27 km/hr. If the total time taken by him is 2 hrs 20 min, the distance is <...
A motor-cycle covers 100 km with a speed of 40 km/hr. find the speed of the motor-cycle for the next 100 km journey so that the average speed of the who...
The distance between two stations is 1520 km. Train A takes 9 hours longer than Train B to cover this distance. If Train B travels 72 km/h faster than T...
A is cycling at an average speed of 20 km/hr such that he can reach a certain point at 12 noon. If he cycles at 30 km/hr, then he will reach the destina...
A man travelled a certain distance by a car and covered half of his journey. Out of the remaining distance, five-sixths was done travelling in a van and...
A car running with a speed of 50 km/hr takes 8 hours to go from 'A' to 'B'. If on the way back from 'B' to 'A', the car takes 20% less time than it take...
Train P starts from Lucknow to Dehradun at 11:55 am with an average speed of 55 m/s. Train Q starts from Dehradun to Lucknow at 1:35 pm with an average ...
Bus X left Delhi for Jaipur at 4:00 am and Bus Y left Jaipur for Delhi at 6:00 am, while at 8:00 am the distance between both buses X and Y is (3T+2) km...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 27 km/hr and 9 km/hr, respectively. If the dis...
Relevant for Exams:
