A boat speed with the diesel is 15 km/hr and the speed of the diesel is 2.5 km/hr. The boat 's speed against the diesel is	Options.
A) 9 km/hr  B) 10 km/hr  C) 12 km/hr  D) 13 km/hr  E) 14 km/hr
Boat's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr.   10 km/hroat's rate against the diesel= (12.5 - 2.5) km/hr = 10 km/hr   10 km/hr
<result>B</result>
A boat speed with the diesel is 15 km/hr and the speed of the diesel is 2.5 km/hr. The boat 's speed against the diesel is