A river flows at speed of 6 km/hr. Surendra swims downstream for some distance in just 12 hours. But he takes 18 hours to return the same distance upstream. How fast is Surendra in still water?
| Question | A river flows at speed of 6 km/hr. Surendra swims downstream for some distance in just 12 hours. But he takes 18 hours to return the same distance upstream. How fast is Surendra in still water? | |
| Type | multiple_choice | |
| Option | 30 km/hr | correct |
| Option | 24 km/hr | incorrect |
| Option | 12 km/hr | incorrect |
| Option | 36 km/hr | incorrect |
Solution
