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
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57042700764312579073km/hr
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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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