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| Q.20 | The ratio of the time taken by a boat to cover 63 km upstream to the time taken by it to cover 144 km downstream is 7 : 8. If the speed of the stream is 4.5 km/h, then in how much time can the boat cover 81 km in still water? | |
| Ans | 1. 8 hrs | |
| 2. 7 hrs | ||
| 3. 6 hrs | ||
| 4. 4 hrs |
Correct Ans: 3
