The speed of a boat in still water in 42 km/hr and the rate of current is 7 km/hr. The distance travelled downstream in 44 minutes is: Choices.
A) 86.6 km B) 46.6 km C) 35.9 km D) 35.6 km E) 26.6 km

Rationale: "speed downstream = ( 42 + 7 ) = 49 kmph time = 44 minutes = 44 / 60 hour = 11 / 15 hour distance travelled = time × speed = 11 / 15 × 49 = 35.9 km answer : c"
Answer: C