Ram, who is half as efficient as Krish, will take 24 days to complete a task if he worked alone. If Ram and Krish worked together, how long will they take to complete the task? Choose the most appropriate option
A) 16 days
B) 12 days
C) 8 days
D) 6 days
E) 18 days
Answer   Ram takes 24 days to complete the task, if he works alone.   Krish is twice as efficient as Ram is. So, working alone, Krish will take half the time to complete the task.i.e., 12 days.   Ram will complete 1/24th of the task in a day.   Krish will complete 1/12th of the task in a day.   When they work together, they will complete 1/24+1/12=1/8th of the task in a day.   Therefore, when they work together they will complete the task in 8 days.   8 dayshoice 8 days
<result>C</result>
Ram, who is half as efficient as Krish, will take 24 days to complete a task if he worked alone. If Ram and Krish worked together, how long will they take to complete the task?