Ram completes 60% of a task in 15 days and then takes the help of Rahim and Rachel. Rahim is 50% as efficient as Ram is and Rachel is 50% as efficient as Rahim is. In how many more days will they complete the work?
Let the total work be 25x units
Ram completes 60% of the task in 15 days.
Ram's efficiency = x units per day
Rahim is 50% as efficient as Ram is and Rachel is 50% as efficient as Rahim is
Efficiency of Rahim = 0.5x units per day
Efficiency of Rahim = 0.25x units per day
Ram will come 15x units in 15 days.
The remaining 10x units of work will be done by Ram, Rahim, Rachel.
=$$\ \frac{10x}{x+0.5x+0.25x}$$
=Â $$\ \frac{10}{1.75}$$
=$$\ \frac{1000}{175}$$
=$$\frac{40}{7}$$
C is the correct answer.
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