Question

A boat takes 90 min less to travel 36m/s down stream then to travel the same distance upstream.If the spread of the boat in still water is 10m/hr.what is the speed of the stream ​

Answer 1

Answer:

57042700764312579073km/hr

Answer 2

Answer:

let speed of stream be x

speed downstream= (10 + x)mph

speed upstreams = (10 - X )mph

=>[36/(10-x)]-[36/(10+x)]=90/60 { to convert 90 minutes into hours=90/60}

=>36[1/(10-x)-1/(10+x)]=90/60

=>[1/(10-x)-1/(10+x)=45

⇒72x×60=90(100−x2)

⇒x2+48x−100=0

⇒(x+50)(x−2)=0

⇒x=2mph

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