A boat goes 13 km upstream (against current) in 39 minutes. The speed of stream (current) is 3 km/hr. What is the speed of the boat in still water?
সমাধান
সঠিক উত্তর: Option A
B-C = 60*13/39 =20km/hr
C = 3km/hr
SO, B =20+3 = 23kmph