Question

A sailor goes 8km downstream in 40 minutes and returns in 1 hour.find the speed of the sailor in still water and the speed of the current.

Answer 1

Let,
the speed of salary in still water be x
the speed of the current be y

Check the picture for full solution...

Speed of sailor in still water is 10km/hr
Speed of the current is 2km/hr

Answer 2

speed = distance/time. s = 8km. t1= 40×60= 2400s. t2= 1 hour = 60 mins = 60×60=3600s

speed = 1000 metres/2400+3600
= 2.9