A boatman goes 2km against the current of stream in 1 hours and goes 1 km along the current in 10 min. To what extent will he take to go 5km in stationary water?

For Competitive Exams

40 min

1 hr.

1 hr.15 min

1 hr.30min

Explanation:

Speed upstream =2km/hr., Speed downstream = 6 km/hr.

Speed in still water = (6 + 2)/2 km/hr. = 4 km/hr.

Time taken to cover 5 km in stationary water = (1/4 $\times$ 5) = 1 hr. 15 min.

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