The speed of a boat in still water in 20 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 24 minutes is: Choose the most appropriate option:	A) 9.6	B) 10.2	C) 9.2	D) 10.4	E) 9.0

Rationale: "speed downstream = ( 20 + 3 ) = 23 kmph time = 24 minutes = 24 / 60 hour = 2 / 5 hour distance travelled = time × speed = 2 / 5 × 23 = 9.20 km answer is c ."
Answer: C