Question
A boat can travel 72 km upstream
and 108 km downstream in 5 hours. Find the speed of the boat in still water if the ratio of the speed of the boat in upstream to the speed of the boat in downstream is 2:3 respectively.Solution
Let the speed of the boat in upstream be ‘2x’ km/h and in downstream be ‘3x’ km/h, respectively. According to the question: 
Speed of the boat in still water = (2x+3x)/2 = (5×14.4)/2 = 36 km/h.
What is the chemical name of baking soda?
Ball pen functions on the principle of :
Which substance is a multibranched polysaccharide of glucose used for energy storage in animals and fungi?
Which of the following is the hardest mineral?
A radioactive substance emits?
The washing machine works on the principle of -
What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius?
Which endocrine gland requires iodine to synthesize a particular hormone, whose deficiency may cause goitre disease?
Which of the following is the most abundant element on earth?
The fossil of Archaeopteryx represents the evidence of origin of
Relevant for Exams:
