Question

speed of a boat in still water is 15km/h It goes hi 30km upstream and returns back in 4hr 30mins find the speed of the stream

Answer 1

let x be speed of stream

according to question :

$\frac{30}{15-x} + \frac{30}{15+x} = 4 \frac{1}{2}$

x² = 225 - 200 

x = 5

thus speed of stream is 5km/hr