A motorboat whose speed is 15 km/hr in still water goes 30km downstream and comes back in four and a half hours. The speed of the stream is:
Solution:Option(D) is correct
Let the speed of the stream be '$s$' km/hr.
Then, upward speed = $(15−s)$ km/hr
and downward speed = $(15+s)$ km/hr
On solving this equation we get, $s$ = 5 km/hr
Edit: A typo in the solution has been corrected after it was pointed out by Vejayanantham TR.
Error(s) Found !!!
Vejayanantham TR (Jun 04'16 at 15:00)
it is not -4.5 , it is just 4.5
Thank you, Vejayanantham for pointing it out. Corrected the typo.
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To write Maths use $ or $$ delimiters. (TeX)Ex: $ax^2+bx+c=0$.
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