This question has been taken from Book:- ML aggarwal, Avichal publication, class10th, quadratic equation in one variable, chapter 5, exercise 5.5

This is an important ques

A boat can cover 10 km up the stream and 5 km down the stream in 6 hours.

If the speed of the stream is 1.5 km/hr.

find the speed of the boat in still water.

Question no.32 , ML Aggarwal, chapter 5, exercise 5.5, quadratic equation in one variable, ICSE board,

Solution:Distance up stream = 10 km

and down stream = 5 km

Total time is taken = 6 hours

Speed of stream = 1.5 km/hr

Let the speed of a boat in still water = x km/hr

According to the condition,