Question

The speed of a boat in still water is 15 km/hr. It goes 30 km upstream and returns downstream to the original point in 7 hour 12 min find the speed of the stream please answer fast

Answer 1

Answer:

Hope this ans helps u. Not sure about the ans

Answer 2

Step-by-step explanation:

let take speed of stream =X km/hr

T=d/S1+d/S2

7hr 12min=30/(15-X)+30/(15+X)

7hr12min=450+30x+450-30x/(-x²+225)

{432×(-x²+225)}÷60=900

-432x²+97200=54000

432x²=43200

x²=43200/432

x²=100

x=10

speed of stream is 10km/hr

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