Question

a boat whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total 0f 4 hours 30 minute. the speed of the stream (in km/hr) is

Answer 1

please mark it as a brainliest answer

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

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