Speed of boat in still water is 20 km/hr and the speed of the current is 5 km/hr. If the distance, he covers against the current is 40 km then how much time he will take to cover the same distance along the direction of current?

1
1.7 hr
2
1.5 hr
3
1.4 hr
4
1.6 hr
5
1.3 hr

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