Ram, who is half as efficient as Krish, will take 30 days to complete a task if he worked alone. If Ram and Krish worked together, how long will they take to complete the task? Pick.
A) 16 days B) 10 days C) 8 days D) 6 days E) 18 days
Number of days taken by Ram to complete task = 30   Since Ram is half as efficient as Krish , Amount of work done by Krish in 1 day = Amount of work done by Ram in 2 days   If total work done by Ram in 30 days is 30w   Amount of work done by Ram in 1 day = w   Amount of work done by Krish in 1 day = 2w   Total amount of work done by Krish and Ram in a day = 3w   Total amount of time needed by Krish and Ram to complete task = 30w/3w = 10 days   Answer 10 days30 /3= 
<gadget id="calculator">30 /3</gadget>
<output>10</output>
10 days   Answer 10 days
<result>B</result>
Ram, who is half as efficient as Krish, will take 30 days to complete a task if he worked alone. If Ram and Krish worked together, how long will they take to complete the task?