Question

speed of a boat in still water is 15 km/h. it goes 30 km upstream and returns back at the same point in 4 hours 30 minutes. find the speed of stream
please help me....

Answer 1

let the speed of stream be x
upstream = 15-x
downstream=15+x
according to given condition,
30/15-x +30/15+x = 45/10
30/15-x + 30/15+x=9/2
further calculations in photo

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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!