The speed of a boat in still water is 15 km/hr. It can go 30 km upstream and return
downstream to the original point in 4 hours 30 minutes. Find the speed of the stream !
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Speed of boat in water-15km
let x be speed of stream
speed of boat in upstream=15-x
Speed of the boat down stream =15+x
Time taken for upstream=30/15-x
Time taken for downstream=30/15+x
T1+T2=9/2
=30/15-X+30/15+X=9/2
=30(1/15-X+1/15+X)=9/2
=30[15+X÷15-X/(15-X)(15+X)]=9/2
=100/225-X2=1/2
=225-X2=200
=X2=25
=X=5KM
Speed of steam = 5km
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