A boat speed is 15 km/h and speed of stream is 5 km/hr. Distance between A and B is 100 km and the boat is travelling downstream from A to B. After travelling (6/10)th of the distance boat developed a fault and it travelled with the speed less than 10 km/h than before. Find the total time taken by him to travel from A to B.

1
8 hr
2
11 hr
3
5 hr
4
7 hr
5
14 hr

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