Two pipes A and B independently can fill a tank in 20 hours and 25 hours. Both are opened together for 5 hours after which the second pipe is turned off. What is the time taken by first pipe alone to fill the remaining portion of the tank?
(A)
11 hours
(B)
13 hours
(C)
15 hours
(D)
17 hours
Answer: (A)
Explanation:
Total unit water = LCM(20, 25) = 100 unit
A’s efficiency = 100/20 = 5 unit/hour
B’s efficiency =100/25 = 4 unit/hour
After 5 hour the water filled by A and B together = 5 x 9 =45 unit
Remaining unit = 100 – 45 = 55 unit
Time taken by A alone = 55/5 = 11 hours
Quiz of this Question
Please comment below if you find anything wrong in the above post
Article Tags :
Recommended Articles
10. | | Question 8
11. | | Question 10
12. | | Question 11
13. | | Question 12
14. | | Question 13
15. | | Question 14
16. | | Question 15
17. | | Question 17
18. | | Question 18
19. | | Question 19
20. | | Question 20
21. | | Question 21
22. | | Question 22
23. | | Question 24
24. | | Question 25
25. | | Question 27