Comprehension Passage
Direction: Read the following information and answer the questions given below:
The line graph shown the time taken by five pipes A, B, C, D, E to fill a tank 'X' alone respectively. The efficiency of all the pipes is the same every time.
If the efficiency of pipe C is increased by 20% and the efficiency of pipe B is decreased by 25%. Then find the ratio of their required time to fill the tank 'X' separately.
1
1 ∶ 3
2
2 ∶ 5
3
3 ∶ 4
4
4 ∶ 3
5
None of these