Question

The speed of a boat in still water is 30km/hr and stream is 6km/hr.what is the time taken by the boat to cover a distance of 5 km in upstream direction

Answer 1

the boat will travel 6 km in 1hr in stream
so 6km in 60 min.
that means 1 km in 10 min
so to travel 5km it will take 50 min