Darshan and Ganesh can do a work independently in 20 days and 30 days. They two started the work, 2 days before completion of the work both Darshan and Ganesh dropped from the work. The remaining work was completed by Kalyan in 10 days. In how many days, Kalyan alone can do the work ?
Solution: The work done by Darshan and Ganesh in 2 days = 2(1/20 + 1/30) = 1/6. this work was done by Kalyan in 10 days.
Number of days, Kalyan alone can do the full work = 10*6 = 60 days.
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