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If time taken to cover (D+11) km upstream is thrice the time taken to cover (D3) km downstream. If ratio of speed of boat

If time taken to cover (D+11) km upstream is thrice the time taken to cover (D3) km downstream. If ratio of speed of boat in upstream to the downstream is 3: 7 and time taken to cover (D+18) km downstream is 2.5 hours what will be the speed of current? 1) 8.2 km/h 2) 6 km/h 3) 8 km/h 4) 6.5 km/h 5) None of these

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