সব প্রশ্নে ফিরে যান
Math
The speed of a boat in still water is 10 km/hr. If it can travel 26 km downstream and 14 km upstream in the same time, the speed of the stream is :
A) 2 km/hr
B) 2.5 km/hr
C) 3 km/hr
সঠিক উত্তর
D) 4 km/hr