A boat moves downstream at the rate of 8 km per hour and

A boat moves downstream at the rate of 8 km per hour and upstream at 4 km per hour. The speed of the boat in still waters is :

Given in question, Rate downstream = 8 kmph
Rate upstream = 4 kmph

∴ Speed of boat in still water =	1	(Rate downstream + rate upstream)
	2

Speed of boat in still water =	1	(8 + 4) kmph =		12		kmph = 6 kmph
	12			4