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Multiple Choice Questions

Ram and Ravi can separately do a piece of work in 20 and 15 days respectively They worked together f...........

Quantitative Aptitude Time and work

Ram and Ravi can separately do a piece of work in 20 and 15 days respectively. They worked together for 6 days, after which Ravi was replaced by Rohit. If the work was finished in next 4 days, then the number of days in which Rohit alone could do the work will be :

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Explanation:

Solution:
Ram and Ravi worked together
1/20+1/15=(3+4)/60= 7/60
they work for 6 days so 7/60*6=7/10
Remaining work 3/10 done by Ram and Rohit.
Ram and Rohit finished in 4days so 3/40.
now 3/40-1/20=1/40 = 40

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