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Asked by Mainak Last Modified
Answer 
Mayuresh Bhatghare
Maths Tutor
Let, speed of boat in still water =u km/hr,
Speed of stream= v km/hr
Speed downstream=u+v,
speed upstream=u-v.
Speed downstream=18+v,
Speed upstream=18-v, 24/t=18+v, 24/t+1=18-v,
Adding both equations we get,
24/t+(24/t+1)=36
Solving we get quadratic equation 3t^2-3t-2=0.
We get t=1 and t=-2/3.
As time cannot be negative t=1.
Speed downstream=24/1=24.
Speed upstream=24/2=12
speed of stream=(1/2)*Speed downstream-Speed upstream
=(24-12)/2=6 km/hr.
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