1.

A boat iwhose speel in 15 kahnll-Watercro e s30 kmdoula streamadedーーCortes laack in a total of 4 houns30Minutes The speed of he storean CiaKa lhei

Answer»

Let the speed of the stream is u km/h

Then,

30/(15+u) + 30/(15-u) = 4.5

30*30/(225-u*u) = 4.5

225 - u*u = 200

u = 5 km/h



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