Since the distance travelled by a boy (going to school and coming back from school) is equal. So, average speed = 2xy/(x + y) Average speed = (2 x 75 x 45)/(75 + 45) Average speed = (2 x 75 x 45)/120 = 56.25 km/hr
What is the scientific name of the common pigeon?
What element is used to make the filament of an electric bulb?
What type of change is exemplified by the burning of wood and digestion of food?
What is the purpose of the INSAT-3DS satellite launched by ISRO?
Cryogenic engines are primarily used in which field?
Which element is most abundant by mass in the earth's crust?
D.N.A. does not contain
Who coined the term ‘zeroth law of thermodynamics’ in 1931?
Ebola disease is caused by which of the following?
What is the zoological name for the common housefly?
