Although I usually tend to rely on the algebraic approach described for this question by other posters, I want to provide an additional approach.
We are told that 90% of the remaining time equals 24 min and 18 seconds.
We can divide this one 90% portion into three 30% portions:
24 min divided by 3 = 3 portions of 8 min
18 sec divided by 3 = 3 portions of 6 sec
Since 30% + 30% = 60%, we then can make the sum of two of the portions to estimate the remaining time when Dara has completed 40% of
...
We are told that 90% of the remaining time equals 24 min and 18 seconds.
We can divide this one 90% portion into three 30% portions:
24 min divided by 3 = 3 portions of 8 min
18 sec divided by 3 = 3 portions of 6 sec
Since 30% + 30% = 60%, we then can make the sum of two of the portions to estimate the remaining time when Dara has completed 40% of
...
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