Question

The speed of the boat in still water is 15km\hr . It can go 30 km upstream and return down stream to the original point in 4hr 30min . Find the speed of the stream

Answer 1

Hey dear FřeïŇðs ❤️☺️☺️


Ur answer is here......



$Time=distance/speed let x be the stream speed relative speed at upstream= 15-x km/h(opposed) relative speed at downstream= 15+x km/h(supported) time needed for upstream= 30/(15-x) h time needed for downstream= 30/(15+x) h so, 4.5= {30/(15-x)}+{30/(15+x)} solve it and you will find x= 5km/h$



Hope its help uh....



Sumit tiwari $from__ Azamgarh (UP)$

Answer 2

Hey there!

Let speed of stream = x km/h

∴ Downstream speed = (15+x) km/h

∴ Upstream speed = (15-x) km/h

∴ 30/(15+x) + 30/(15-x) = 4 1/2

→ 900/225-x² = 9/2

→ 9x² = 225

→ x² = 25

→ x = 5

∴ Speed of stream = 5 km/h

Hope it Helps You!