The speed of a boat in still water in 26 km/hr and the rate of current is 6 km/hr. The distance travelled downstream in 20 minutes is:
Choose one:
A) 10.4 km
B) 10.66 km
C) 11.4 km
D) 11.22 km
E) 12 km

Rationale: "explanation : speed downstream = ( 26 + 6 ) = 32 kmph time = 20 minutes = 20 / 60 hour = 1 / 3 hour distance travelled = time × speed = ( 1 / 3 ) × 32 = 10.66 km answer : option b"
Answer: B