Question
The ratio of the speed of 'B' to that of 'C' is 1:2. 'B' covers 'I' km in 9 hours and 'C' covers (I + 90) km in 6 hours. Find the time taken by 'D', whose speed is 50% of the combined speed of 'B' and 'C' together, to cover (I + 180) km.
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