questionFromString.label: SBI PO Mains 2017

If E and F together work for 24 days then they are replaced by A and B respectively then they can do the remaining work in20 days. If the efficiency of E and F is 5 : 4, If E and F together complete the whole work then find the difference between the work done by E alone and the total work done by F alone ?
1:
1/7
2:
1/9
3:
1/6
4:
3/7
5:
1/3
solution.label:
chapterName.label: Time and Work
difficultyLevel.label: Moderate

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