Question
Person A can complete 25% of a job in 4 days. Person B is
20% less efficient than Person A. How many days will it take for both A and B, working together, to complete 90% of the job?Solution
‘A’ can complete whole work alone in 4/0.25 = 16 days
‘B’ can complete the whole work in = 16/0.80 = 20 days
Let the total work = 80 units
Efficiency of ‘A’ = 80/16 = 5 units/day
Efficiency of ‘B’ = 80/20 = 4 units/day
Required time taken = 0.9 × 80/(5 + 4) = 8 days
Aman starts from his house and walks 4 km towards north. Then he turns right and walks 2 km and then turns right and walks 6 km, then turns right and wa...
What is the direction of B with respect to O?
If L is 11m east of F then L is in which direction of H?
Nikita walks 2kms towards West, turns right and walks 1 km. Again she turns right and walks 2 kms. She again turns right and walks another 2 kms. How fa...
What is the shortest distance between point M and point N?
If point F comes exactly between points Y and Z, then find the distance between F and M?
Eight points D, E, F, G, H, I, J, and K are marked in a school field. D is 12m south of F. I is 3m east of K, which is 8m south of E. G is 14m north of ...
A man travels 25m towards the east and then turns 90° to his right and travels another 4 m. Finally, he turns right and covers 25 m. In which direct...
One evening Tridev and Aadil were talking to each other face to face at a crossing. If Aadil's shadow was exactly to the right of Tridev, which directio...
What is the direction of E with respect to point J?
Relevant for Exams:
