Question

Speed of the boat in still water is 15 km . It goes 30 km upstream

Answer 1

Explanation:

hello don't mind please....but I think you have asked incomplete question

Answer 2

Explanation:

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

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