The ratio of the speed of a boat to that of the current water is 35 : 8. The boat goes along with the current in 5 hours 10 minutes. What will be the time taken by the boat to come back?
1
5 hours 15 minutes 58 seconds
2
9 hours 30 minutes 49 seconds
3
6 hours 45 minutes 10 seconds
4
8 hours 13 minutes 48 seconds