Question
Rohan can finish a certain task in 18 days, whereas Rohan
and Karan together can complete it in 4.5 days. How many days will Karan alone take to complete the task?Solution
ATQ;
Rohan and Karan together take 9/2 days.
Time taken by Karan alone to complete the task =1/[(2/9) - (1/18)] = 1/(4/18) = 18/4 = 9/2
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