Q. 304.7( 6 Votes )

A motorboat whose

Answer :

Let the speed of the stream be x km/h.


The speed of the boat upstream = (18 – x) km/h


And the speed of the boat downstream = (18 + x) km/h


We know that time = distance/speed


Time taken to go upstream hours


Also, time taken to go downstream hours


Given


24 (18 + x) – 24 (18 – x) = (18 – x) (18 + x)


x2 + 48x – 324 = 0


We know that quadratic formula


Using the quadratic formula, we get






= 6 or -54


Since x is the speed of the stream, it cannot be negative.


x = 6 gives the speed of the stream as 6 km/h.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
All GrammarAll GrammarAll Grammar41 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses