Question

A man takes 3 hours 45 minutes to row a boat downstream of a river and 2 hours 30 mins to cover a distance of 5 km upstream

Answer 1

We have to find the speed of a current.

t ( downstream ) = 3 h 45 min = 3.75 h

t ( upstream ) =  2 h 30 min = 2.5 h

Speed downstream = 15 km / 3.75 h = 4 km/h

Speed upstream = 5 km / 2.5 h = 2 km/h

And the formula is:

Speed of the current = ( Speed downstream - speed upstream ) / 2

Speed of a current = ( 4 km/h - 2 km/h ) / 2 = 2 km/h / 2 = 1 km/h

Answer:

The speed of the current is 1 km/h.

Answer 2

Abcdefghijklmnopqrstuvwxyz