The speed of a boat in still water is 18 km/hr and the rate of current is 4 km/hr. The distance travelled downstream in 14 minutes is  Choose the correct choice from the following options: A) 1.6 km B) 2 km C) 5.1 km D) 4 km E) none of these

Rationale: "explanation : speed downstreams = ( 18 + 4 ) kmph = 22 kmph . distance travelled = ( 22 x 14 / 60 ) km = 5.1 km option c"
Answer: C