A boat goes downstream. The speed of the boat in still water is 30 km/hr. The speed of the stream is 6 km/hr. The boat goes 50 km and returns to half of the distance. How much time will be taken on the whole travel?

1
1.42 hours
2
2.42 hours
3
3.42 hours
4
4.42 hours
5
None of these

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